Let’s go through each question one by one and solve them carefully.
---
1) 20 - 13
Start at 20, take away 13:
20 - 10 = 10, then 10 - 3 = 7
→
7
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2) How many sides does an octagon have?
“Octa” means eight — like octopus has 8 arms.
→
8
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3) 6 x 4
6 groups of 4: 4 + 4 + 4 + 4 + 4 + 4 = 24
Or just remember: 6×4=24
→
24
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4) Write down a multiple of 7 between 20 and 30.
Multiples of 7: 7, 14, 21, 28, 35...
Between 20 and 30 → 21 and 28 work. Pick one.
→
21 (or 28)
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5) 6 + 800
Just add: 800 + 6 = 806
→
806
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6) Make 7 ten times bigger.
Ten times bigger = multiply by 10
7 × 10 = 70
→
70
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7) What is the perimeter of this shape?
It’s a rectangle with sides 4 mm and 5 mm.
Perimeter = add all sides: 4 + 5 + 4 + 5 = 18 mm
Or: 2 × (length + width) = 2 × (5 + 4) = 2 × 9 = 18
→
18 mm
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8) What is ½ as a decimal?
Half of 1 is 0.5
→
0.5
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9) What is the difference between 32 and 18?
Difference = subtract smaller from bigger: 32 - 18
32 - 10 = 22, 22 - 8 = 14
→
14
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10) How much more do I need to make £1?
Coins shown: two 20p, one 5p, one 1p
Total so far: 20 + 20 + 5 + 1 = 46p
£1 = 100p
Need: 100 - 46 = 54p
→
54p
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11) How many minutes in ¼ of an hour?
1 hour = 60 minutes
¼ of 60 = 60 ÷ 4 = 15
→
15 minutes
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12) I am a 3d shape. I have 6 faces and all my faces are square. Who am I?
That’s a cube! All sides equal, 6 square faces.
→
Cube
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13) 18 ÷ 6
How many 6s in 18? 6×3=18 → answer is 3
→
3
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14) Round 864 to the nearest 10.
Look at the last digit: 4 → less than 5, so round down
864 → 860
→
860
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15) In a school, a quarter of a class are boys. What fraction are girls?
Whole class = 1 (or 4/4)
Boys = 1/4
Girls = 1 - 1/4 = 3/4
→
¾
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16) 5 + 7 = ___ x 3
Left side: 5 + 7 = 12
So: 12 = ? × 3
What number times 3 is 12? → 4
→
4
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Final Answer:
1) 7
2) 8
3) 24
4) 21 (or 28)
5) 806
6) 70
7) 18 mm
8) 0.5
9) 14
10) 54p
11) 15 minutes
12) Cube
13) 3
14) 860
15) ¾
16) 4
Parent Tip: Review the logic above to help your child master the concept of printable worksheets year 9.
