Bar Model Addition and Subtraction

If you know the parts and you need to find the whole...do you add or subtract?

• add

• subtract

How many boys are in the group?

• 149

• 134

• 121

• 119

What is the missing part?

• 3

• 6

• 7

• 9

The girls have 151 gold stars. The boys have 23 fewer gold stars. How many gold stars do the boys have?

• The boys have 174 gold stars.

• The girls have 23 less gold stars than the boys.

• The boys have 128 gold stars.

Use the bar model to complete the number sentences.

Choose ALL of the equations that match the bar model.

• 2 + 7 = 9

• 7 + 2 = 9

• 9 - 2 = 11

• 9 - 7 = 2

Which equation does NOT match the bar model?

• 3 + 5 = 8

• 8 - 5 = 3

• 8 + 0 = 8

Which equation matches the number bond?

• 13 + 7 = 6

• 13 - 7 = 6

These equations are related. True or false?

• True

• False