Filling in the ratio table
You learn to fill in a ratio table, even when it does not work in one step.
How to work it out
- Find how you get from the first number on top to the last one.
- If that does not work in one step, go to 1 first: divide by the first number.
- Then go from 1 to the number you want: multiply by that number.
- Do exactly the same on the top and underneath.
2
4
6
12
Top: 2 and 4. Bottom: 6 and ?
- On top you go from 2 to 4: that is times 2.
- Do times 2 underneath too: 6 × 2 = 12.
- It goes with 12.
More examples
Top: 2 and 5. Bottom: 6 and ?
- You cannot get from 2 to 5 in one step.
- Go to 1 first: divide the top and the bottom by 2, so underneath 6 ÷ 2 = 3.
- Then go to 5: multiply by 5, so underneath 3 × 5 = 15.
- It goes with 15.
2
6
5
15
Top: 4 and 6. Bottom: 10 and ?
- Go to 1 first: divide by 4, so underneath 10 ÷ 4 = 2.5.
- Then go to 6: multiply by 6, so underneath 2.5 × 6 = 15.
- It goes with 15.
4
10
6
15