Huh Lab Maths

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Cambridge Primary Maths: Stage 2

Stage 2 of the Cambridge Primary Mathematics (0096) curriculum framework, usually Year 2 (ages 6 to 7). Here is what each part asks, a practice question for each, and the mistakes that cost the most marks.

Practise Stage 2 as a game

The 42 parts of Stage 2

Each part with one practice question, made by the same engine your child plays.

Counting and sequences

Count up to 100 objects

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

See how many there are in an unfamiliar pattern (up to 10) without counting

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Estimate up to 100 objects

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Count on and back in ones, twos, fives or tens from any number to 100

What comes next?
0, 10, 20, 30, …

  1. 37
  2. 31
  3. 40
  4. 50
Show the answer

40. The numbers go up in 10s. 30 + 10 = 40.

Odd and even numbers to 100

Which number is even?

  1. 10
  2. 83
  3. 35
  4. 55
Show the answer

10. 10 ends in 0, so it is even.

Recognise, describe and extend number sequences to 100

28, 30, 32, 34, ...
What is the rule?

  1. Add 2 each time
  2. Add 3 each time
  3. Take away 2 each time
  4. Add 4 each time
Show the answer

Add 2 each time. Find the gap between neighbours: 30 − ... 28 gives 2. Every gap is the same, and the numbers go up.

Integers and powers

Say, read and write numbers and number names to 100

Which number is "ninety"?

  1. 9
  2. 100
  3. 19
  4. 90
Show the answer

90. ninety is written 90.

How addition and subtraction undo each other

48 + 16 = 64
So 64 − 16 = ?

  1. 80
  2. 16
  3. 64
  4. 48
Show the answer

48. Subtracting 16 undoes adding 16, so you are back at 48.

Complements of 20, and of multiples of 10 up to 100

? + 3 = 20

  1. 7
  2. 3
  3. 23
  4. 17
Show the answer

17. 17 + 3 = 20.

Estimate, add and subtract numbers with up to two digits

13 + 58 = ?

  1. 71
  2. 81
  3. 61
  4. 72
Show the answer

71. 13 + 58 = 71.

Multiplication as repeated addition and as an array

6 × 10 = ?

  1. 50
  2. 16
  3. 70
  4. 60
Show the answer

60. 6 lots of 10 is 60.

Division as sharing and as grouping

12 sweets are put into bags of 2.
How many bags are filled?

  1. 10
  2. 14
  3. 6
  4. 2
Show the answer

6. Grouping: count in 2s up to 12. That is 6 bags, because 6 × 2 = 12.

The 1, 2, 5 and 10 times tables

4 × 5 = ?

  1. 20
  2. 15
  3. 9
  4. 25
Show the answer

20. 4 lots of 5 is 20.

Money

Value and notation of local money

How much money?
20c + 20c + 10c + 5c

  1. 65c
  2. 50c
  3. 55c
  4. 40c
Show the answer

55c. 20 + 20 + 10 + 5 = 55c.

Compare different combinations of coins or notes

Set A: 1c, 50c, 5c
Set B: 2c, 1c, 10c, 5c, 5c
Which set is worth MORE?

  1. Set B
  2. You cannot tell without counting the coins
  3. They are worth the same
  4. Set A
Show the answer

Set A. Add each set: A is 56c and B is 23c. A is worth more. More coins does not always mean more money.

Place value, ordering and rounding

The value of each digit in a 2-digit number; zero as a place holder

What is the value of the 4 in 48?

  1. 80
  2. 8
  3. 40
  4. 4
Show the answer

40. The 4 is in the tens place, so it is worth 40.

Make, split and regroup 2-digit numbers with tens and ones

5 tens and 13 ones make what number?

  1. 53
  2. 513
  3. 18
  4. 63
Show the answer

63. 13 ones is 1 ten and 3 ones. So it is 6 tens and 3 ones: 63.

Compare and order 2-digit numbers

Which number is the biggest?

  1. 70
  2. 56
  3. 65
  4. 62
Show the answer

70. Compare the tens first, and the ones only if the tens are the same. 70 is the biggest of 56, 65, 70, 62.

Use ordinal numbers

Children queue in this order:
Sara, Tom, Ben, Lena, Kai, Aisha.
Who is 5th in the queue?

  1. Tom
  2. Ben
  3. Lena
  4. Kai
Show the answer

Kai. Count along the queue: 1st Sara, 2nd Tom, … 5th is Kai.

Round 2-digit numbers to the nearest 10

Round 12 to the nearest 10.

  1. 10
  2. 20
  3. 12
  4. 0
Show the answer

10. 12 is between 10 and 20. The ones digit is 2, so it rounds down to 10.

Fractions, decimals, percentages, ratio and proportion

A shape split into four equal or four unequal parts

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

A quarter as one of four equal parts of a set or quantity

What is 1/2 of 12?

  1. 10
  2. 6
  3. 24
  4. 2
Show the answer

6. 12 ÷ 2 = 6.

A half and a quarter read as a division

Finding a quarter of 24 is the same as...

  1. 24 × 4
  2. 24 ÷ 4
  3. 24 ÷ 2
  4. 24 − 4
Show the answer

24 ÷ 4. A quarter means 4 equal parts, so share 24 into 4: 24 ÷ 4 = 6.

Half, quarter and three-quarters as operators

What is three-quarters of 8?

  1. 4
  2. 5
  3. 2
  4. 6
Show the answer

6. A quarter of 8 is 8 ÷ 4 = 2. Three quarters is three of those: 2 × 3 = 6.

Relative size of a quarter, half, three-quarters and 1; two quarters equal a half

How many quarters make three-quarters?

  1. 2
  2. 3
  3. 4
  4. 1
Show the answer

3. Three-quarters means three of the four quarters.

Wholes, halves and quarters combine to make new fractions

2 whole pizzas and a half.
How many HALVES is that?

  1. 3
  2. 5
  3. 4
  4. 6
Show the answer

5. Each whole is 2 halves: 2 × 2 = 4, and one more half makes 5.

Time

Order and compare units of time, seconds to years

Which is SHORTER: a second or a year?

  1. a year
  2. a second
  3. it depends
  4. they are the same
Show the answer

a second. From shortest to longest: second, minute, hour, day, week, month, year. A year is longer than a second.

Read and record time to five minutes, digital and analogue

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Read and use calendars

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Geometrical reasoning, shapes and measurements

Identify, sort, name and sketch 2D shapes: regular polygons, sides, vertices, any orientation

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

A circle has a centre, and every point on it is the same distance from the centre

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Identify, sort and name 3D shapes: faces, edges, vertices

Which of these is a 3D (solid) shape?

  1. rectangle
  2. hexagon
  3. square
  4. cuboid
Show the answer

cuboid. A cuboid is solid: you could pick it up. A rectangle, a square and a hexagon are flat.

Spot 2D and 3D shapes in familiar objects

A candle is shaped most like a...

  1. cone
  2. cylinder
  3. cube
  4. cuboid
Show the answer

cylinder. A candle is a cylinder.

A horizontal or vertical line of symmetry

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

How many times a shape looks the same in a full turn

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

An angle describes a turn: whole, half and quarter, clockwise and anticlockwise

You face south and make a quarter turn anticlockwise.
Which way are you facing now?

  1. north
  2. south
  3. east
  4. west
Show the answer

east. A quarter turn is 1 right angle. Clockwise goes north, east, south, west; anticlockwise goes the other way. From south you end at east.

A measuring scale is a number line whose in-between points have value

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Position and transformation

Describe movement using position and direction

You face north and make a half turn anticlockwise.
Which way are you facing now?

  1. north
  2. south
  3. east
  4. west
Show the answer

south. A half turn is 2 right angles. Clockwise goes north, east, south, west; anticlockwise goes the other way. From north you end at south.

Reflect a 2D shape in a vertical mirror line

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Statistics

Record and show categorical data: lists, tables, Venn, Carroll, tally charts, block graphs, pictograms

Children were asked their favourite fruit:
banana, apple, pear, pear, grape, apple, pear, pear, grape, pear, pear, pear, banana, grape, banana, banana, grape, banana, banana, banana, banana, banana, apple, pear, apple, banana
Count them into a table. How many chose pear?

  1. 9
  2. 26
  3. 7
  4. 8
Show the answer

8. Go through the list once, making a mark for each pear: there are 8.

Describe data: what is alike and what varies

The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.

Probability

Language of pattern and randomness

Two children each laid out 8 counters.
A: blue, red, blue, red, blue, red, blue, red
B: red, red, blue, red, blue, blue, blue, red
Which line is a RANDOM pattern?

  1. neither of them
  2. B
  3. both of them
  4. A
Show the answer

B. Line A repeats "blue, red" every time: that is regular, and you can say what comes next. Line B has no rule you can follow: that is random.

The mistakes that cost the most marks

Huh Lab checks every wrong answer against known mistakes like these, and goes back to the step behind the one your child keeps making.

Counts rows of ten as ones

Each full row is TEN. Count the rows in tens (10, 20, 30...) and then add the extras one at a time.

Takes away instead of sharing

A quarter of 12 is 12 shared into 4 equal groups, not 12 take away 4.

Reads the digit, not its value

In 47 the 4 is four TENS. Say the number aloud in tens and ones.

Thinks any four parts are quarters

Quarters must be four EQUAL parts. Cut a sandwich unevenly and nobody calls the pieces quarters.

Adds when the question needs times

5 scoops of 100 is 100 five times, which is 5 × 100, not 5 + 100.

Multiplies to find a fraction of a number

Half of something is SMALLER than it: share it out, which is dividing.

Writes the fraction upside down

The bottom number is how many equal parts the whole is cut into.

Slides the point instead of reflecting it

The image is the same distance from the mirror, on the OTHER side.

Other Cambridge Primary Maths stages

Stage 1Year 1, ages 5 to 6 Stage 3Year 3, ages 7 to 8 Stage 4Year 4, ages 8 to 9 Stage 5Year 5, ages 9 to 10 Stage 6Year 6, ages 10 to 11

Practise it as a game

Short rounds on any topic, a new question every time, the exact mistake found, and a report to you after every session.

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