Video Transcript
We can find easier sums to help us add. Find the missing number. 54 add 18 is equal to the missing number add 20. What is 54 add 18?
To make it easier to add 18 to 54, we can round it up to the nearest 10, which is 20. To do this, we add two to 18. That means we need to take away two from 54. So 54 add 18 is equal to 52 add 20. The missing number is 52. And 52 add 20 or 54 add 18 equals 72.
