Count over the 100s boundary (3)

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

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Here we have some serious 2-digit addition. On the first two pages the answers all come to just more than 100.

Subtracting 2-digit multiples of 10, often crossing the hundreds boundary

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

More subtraction by counting on.

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