More mental subtraction skills

Use bar models to help with subtraction by counting on.

Subtract 9 from 3-digit numbers.

More subtraction by counting on.

Remember that subtractions can also be done by subtracting the nearest whole ten and adjusting.

Using counting on to solve subtraction problems, crossing whole hundreds.

Sometimes quite tricky subtractions can be made easy by counting up. Have a look at these to see why.

Now we are on to subtracting multiples of 100, often crossing the thousands boundary.

Write a digit in each box so that the calculation is correct. look for patterns.