Quick mental subtraction

Using bar models to help with addition and subtraction word problems.

Subtract a number near 1,000 by adjusting.

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

Finding change by counting on.

Subtracting a single digit from a 3-digit number, starting with multiples of 100.

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

Using place value grids with addition and subtraction.

Problems in words. Not too tricky, but ask how they were done as this reveals a great deal about children's thinking.