Level 2 PSLE The sum of two numbers is 79. One of the numbers is a multiple of 7. The other number is a factor of 18. What is the difference between the 2 numbers?
Number 1 + Number 2 = 79
Number 1 is a factor of 18.
Factors of 18: 1, 2, 3, 6, 9, 18
Number 2 is a multiple of 7.
To be a multiple of 7, Number 2 must have no remainder when divided by 7.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 7? |
Is the remainder 0? |
18 |
79 - 18 = 61 |
61 ÷ 7 = 8 r 5 |
x |
9 |
79 - 9 = 70 |
70 ÷ 7 = 10 r 0 |
✓ |
Difference between the 2 numbers
= 70 - 9
= 61
Answer(s): 61