Addition and subtraction of 2-digit numbers

Mental addition and subtraction of 2-digit numbers. These are about as hard as you would expect to get without using written methods.

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Using place value grids with addition and subtraction.

Use the place value chart and counters to help with subtracting 4-digit numbers.

Use the place value table to help add and subtract.

Subtract multiples of 100 from 4-digit numbers with bar models.

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