Huh Lab Maths › Cambridge Primary Maths › Stage 3
Stage 3 of the Cambridge Primary Mathematics (0096) curriculum framework, usually Year 3 (ages 7 to 8). Here is what each part asks, a practice question for each, and the mistakes that cost the most marks.
Each part with one practice question, made by the same engine your child plays.
One scoop holds about 50 marbles.
A jar is filled with 8 scoops.
About how many marbles are in the jar?
About 400. 8 scoops of about 50: 8 × 50 = about 400. Estimating from one known amount is how big numbers of things are guessed well.
What comes next?
125, 134, 143, 152, …
161. The numbers go up in 9s. 152 + 9 = 161.
Which number is odd?
41. 41 ends in 1, so it is odd.
? + 1 = 10
9. 9 + 1 = 10.
96, 87, 78, 69, …
The same number is taken away each time.
What number is it?
9. 87 is 96 − 9, and the same gap comes every time. The rule is "subtract 9".
Step 1: ■
Step 2: ■■
Step 3: ■■■
The pattern grows the same way each step.
How many squares in step 6?
6. It grows by 1 each step: 1, 2, 3, 4, 5, 6. Step 6 has 6.
Which number is "eight hundred and seventy-seven"?
877. eight hundred and seventy-seven is written 877.
Which is the smartest way to work out 28 + 68 + 2?
(28 + 2) + 68. Addition can be done in any order (it is commutative and associative). 28 + 2 = 30, a tidy number, and then + 68 = 98.
21 + ? = 100
79. 21 + 9 = 30, then on to 100. Altogether 79.
142 + 582 = ?
724. 142 + 582 = 724.
3 × 7 = 21.
Which division is ALSO true?
21 ÷ 7 = 3. Division undoes multiplication: 3 groups of 7 make 21, so 21 shared into groups of 7 gives 3. (21 ÷ 3 = 7 is true too.)
Which is the smartest way to work out 21 + 34 + 9?
(21 + 9) + 34. Addition can be done in any order (it is commutative and associative). 21 + 9 = 30, a tidy number, and then + 34 = 64.
4 × 5 = ?
20. 4 lots of 5 is 20.
Which is the best ESTIMATE of 25 × 3?
90. Round 25 to 30, then 30 × 3 = 90.
36 ÷ 3 = ?
12. Split 36 into parts that divide easily: 30 ÷ 3 = 10, and 6 ÷ 3 = 2. Together 12. Check: 12 × 3 = 36.
Which number is a multiple of 2?
932. Multiples of 2 end in 0, 2, 4, 6 or 8. 932 ÷ 2 = 466.
$1.05 + $3.00 = ?
$4.05. $1.05 + $3.00 = $4.05.
You pay with $5.00 for something that costs $4.25.
How much change do you get?
$0.75. $5.00 − $4.25 = $0.75. Check: $4.25 + $0.75 = $5.00.
What is the value of the 7 in 879?
70. The 7 is in the tens place: 70.
29 × 10 = ?
290. Every digit moves one place to the left and a zero holds the ones place: 290.
428 = 4 hundreds + 1 tens + ? ones
18. One of the tens is regrouped as 10 ones: 8 + 10 = 18 ones.
Which statement is true?
649 > 469. Compare the hundreds, then the tens, then the ones. 649 is the bigger number, so 469 < 649. The open end of the sign faces the bigger number.
Round 571 to the nearest 100.
600. 571 is between 500 and 600. It is closer to 600.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
A square is cut corner to corner into two triangles.
Are the triangles halves of the square?
Yes: they are equal parts of the whole. Any two EQUAL parts of a whole are halves, whatever their shape and whichever way up the whole is.
What is 3/4 of 12?
9. 12 ÷ 4 = 3. Then 3 × 3 = 9.
Which fraction is the same as 2 ÷ 3?
2/3. A fraction IS a division: the top divided by the bottom. 2 ÷ 3 = 2/3.
What is 3/4 of 36?
27. 36 ÷ 4 = 9. Then 9 × 3 = 27.
Which fraction is equal to 1/2?
5/10. Multiply the top and the bottom by 5: 1/2 = 5/10.
8/12 − 4/12 = ?
4/12. The parts are the same size (12ths), so just subtract how many there are: 8 − 4 = 4. The denominator stays 12.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
A blink takes about 1 ___.
Which unit fits?
second. A blink takes about 1 second. The other units would make it far too short or far too long.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
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 months are there in 5 years?
60. A year has 12 months: 5 × 12 = 60.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
4,000 ml = ? l
4 l. 1,000 ml make 1 l, so 4,000 ÷ 1,000 = 4 l.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
Which of these is a 3D (solid) shape?
triangular prism. A triangular prism is solid: you could pick it up. A square, a triangle and a hexagon are flat.
2,000 g = ? kg
2 kg. 1,000 g make 1 kg, so 2,000 ÷ 1,000 = 2 kg.
8 km = ? m
8,000 m. 1 km = 1,000 m, so 8 km = 8 × 1,000 = 8,000 m.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
Which direction is exactly half way between east and south?
south-east. Half way between east and south is south-east: the name is made from the two it sits between.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
Which is the best way to show which shapes are red AND which have 4 sides, sorted two ways?
A Carroll diagram. Counts of each thing: a bar chart or frequency table. Things that belong to two groups at once: a Venn diagram. Sorting two ways (yes/no and yes/no): a Carroll diagram.
The questions for this part come with a picture or are played as a game, so they are best tried in Huh Lab.
"A dog will fly to the moon today."
Is this something that...
will not happen. This is impossible: it can never happen.
Huh Lab checks every wrong answer against known mistakes like these, and goes back to the step behind the one your child keeps making.
Perimeter is the fence around it. Area is the grass inside.
5 scoops of 100 is 100 five times, which is 5 × 100, not 5 + 100.
Trace all the way round the shape with a finger while counting sides.
The bottom number is how many equal parts the whole is cut into.
In 47 the 4 is four TENS. Say the number aloud in tens and ones.
The SHORT hand shows the hour, the LONG hand the minutes.
The corner belongs to both arms: count it once.
The biggest number (the total) comes first in a division: 42 ÷ 6, not 6 ÷ 42.
Short rounds on any topic, a new question every time, the exact mistake found, and a report to you after every session.
15 extra days free with your first month · Up to 5 children · 30-day money-back guarantee