Patterns in subtraction II

Here we will use patterns in subtraction to help us find the difference between a two-digit and single-digit number.

Sometimes, you can partition or split the tens number to help. For example, 16 is the same as one ten and 6 ones.

Let's look at an example, can you see a pattern in the difference sum or the answers?

$$16−9=7

$$26−9=17

$$36−9=27

So, in this example, we can see that when subtracting 9 from a two-digit number ending in six, you get an answer with a number ending in seven.

Worked Examples

question 1

question 2

question 3