Level 2 PSLE The sum of two numbers is 79. One of the numbers is a multiple of 8. The other number is a factor of 21. What is the difference between the 2 numbers?
Number 1 + Number 2 = 79
Number 1 is a factor of 21.
Factors of 21: 1, 3, 7, 21
Number 2 is a multiple of 8.
To be a multiple of 8, Number 2 must have no remainder when divided by 8.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 8? |
Is the remainder 0? |
21 |
79 - 21 = 58 |
58 ÷ 8 = 7 r 2 |
x |
7 |
79 - 7 = 72 |
72 ÷ 8 = 9 r 0 |
✓ |
Difference between the 2 numbers
= 72 - 7
= 65
Answer(s): 65