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Maths · Year 3

Bell.Study

Doubling and halving

Doubling numbers and finding half of even numbers

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Try each question. If you're stuck, leave it and come back. The answer key is on the last page.

1
Double 16 = ___ Double 16 = ___
Answer:
2
Half of 40 = ___ Half of 40 = ___
Answer:
3
What is double 25? A) 45 B) 50 C) 52 D) 75
Answer:
4
Double 18 = ___ Double 18 = ___
Answer:
5
Double 35 = ___ Double 35 = ___
Answer:
6
What is half of 84? A) 32 B) 40 C) 42 D) 44
Answer:
7
Half of 56 = ___ Half of 56 = ___
Answer:
8
Double 48 = ? A) 86 B) 88 C) 96 D) 98
Answer:
9
True or false? Double 75 is 150. A) True B) False
Answer:
10
Half of 120 = ? A) 50 B) 55 C) 60 D) 65
Answer:

Answer key

Doubling and halving · for parents and teachers

1
32
16 + 16 = 32, so double 16 is 32.
2
20
40 ÷ 2 = 20, so half of 40 is 20.
3
50
25 + 25 = 50. Two 25p coins make 50p.
4
36
18 + 18 = 36.
5
70
Double 30 = 60, and double 5 = 10. 60 + 10 = 70.
6
42
Half of 80 = 40, and half of 4 = 2. 40 + 2 = 42.
7
28
Half of 40 = 20, and half of 16 = 8. 20 + 8 = 28.
8
96
Double 40 = 80, and double 8 = 16. 80 + 16 = 96.
9
True
True. Double 70 = 140, and double 5 = 10. 140 + 10 = 150.
10
60
Half of 100 = 50, and half of 20 = 10. 50 + 10 = 60.