Dot problems with plus
You learn to find the missing number under the dot in an addition.
How to work it out
- Look at the answer and the known number.
- Take the known number away from the answer.
- Then you find exactly the number under the dot.
24 + · = 60
- Look at the answer: 60.
- Take away the number you know, 24: 60 − 24 = 36.
- Check with an addition: 24 + 36 = 60.
- The number under the dot is 36.
More examples
35 + · = 60
- Take 35 away from 60.
- Work it out: 60 − 35 = 25.
- The number under the dot is 25.
· + 18 = 42
- Take 18 away from 42.
- Work it out: 42 − 18 = 24.
- The number under the dot is 24.