Level 2 PSLE The sum of two numbers is 87. 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 = 87
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 |
87 - 21 = 66 |
66 ÷ 10 = 6 r 6 |
x |
7 |
87 - 7 = 80 |
80 ÷ 10 = 8 r 0 |
✓ |
Difference between the 2 numbers
= 80 - 7
= 73
Answer(s): 73