Level 2 PSLE The sum of two numbers is 57. One of the numbers is a multiple of 10. The other number is a factor of 21. What is the difference between the 2 numbers?
Number 1 + Number 2 = 57
Number 1 is a factor of 21.
Factors of 21: 1, 3, 7, 21
Number 2 is a multiple of 10.
To be a multiple of 10, Number 2 must have no remainder when divided by 10.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 10? |
Is the remainder 0? |
21 |
57 - 21 = 36 |
36 ÷ 10 = 3 r 6 |
x |
7 |
57 - 7 = 50 |
50 ÷ 10 = 5 r 0 |
✓ |
Difference between the 2 numbers
= 50 - 7
= 43
Answer(s): 43