Subtraction up to 10

Taking away from numbers up to 10 is built up in order: subtracting within 5, subtracting within 10, then subtracting 0. Besides Calculation and Fill in the Blank, Word Problems (with Pictures) ask what is left in a picture, and Word Problems in words only extend the work to reading a take-away situation.

Mixing up 7 - 0 and 7 - 7 and answering 0 for both stands out. In Fill in the Blank, children add the two visible numbers instead, giving 13 for 9 - □ = 4. If the answer is larger than the number being subtracted from, no subtraction has taken place.

The view of combining and counting gained in Addition up to 10 is applied here to situations where something is taken away instead. The sense that an answer cannot exceed the number it was subtracted from is called on again in Addition and Subtraction up to 20, when checking work that involves no carrying.