Division is the opposite of multiplying. If you know a multiplication fact you can find a division fact:
Example: 3 × 5 = 15, so 15 / 5 = 3.
Also 15 / 3 = 5.
Why? Well it is easy to understand if you think of the numbers in rows and columns like in this illustration:
 |
| Multiplication... | ...Division |
| 3 groups of 5 make 15... | so 15 divided by 3 is 5 |
| |
and also: | |
| |
| 5 groups of 3 make 15... | so 15 divided by 5 is 3. |
| |
|
|
So there are four related facts:
- 3 × 5 = 15
- 5 × 3 = 15
- 15 / 3 = 5
- 15 / 5 = 3
Knowing your Multiplication Tables can help you with division!
Example: What is 56 ÷ 7 ?
Searching around the multiplication table you find that 56 is 7 × 8, so 56 divided by 7 must be 8. Answer: 56 ÷ 7 = 8.
0 comments:
Post a Comment