Too easy. Now tell me what comes before this number. Great job I had four what comes before four? Three. You're amazing. For this lesson, our learning intention is to solve subtraction problems ...

Take a look at this number line. It shows 14 - 5 = 9. You can count backwards down the number line to subtract. Look at this part-whole model. There is a number missing from one of the parts.

Explains the concept of zero in mathematics, emphasizing its role as a number that represents the empty set. It illustrates how zero is used in addition and subtraction, showing that adding or ...