Mental Math
20-5=
15
9-5=
4
30-5=
25
30-20=
10
Ethan has 31 hot wheel cars. His friend came over and Ethan gave him 19 of the hot wheel cars. How many hot wheels does Ethan have left?
Ethan has 12 hot wheel cars left.
21-1=
20
8-6=
2
41-6=
35
25-17=
8
Rosie earned $1.00 helping her Mom plant some sunflowers. She spent .50 cents at the store. How much money does Rosie have left?
Rosie has .50 cents left.
45-5=
40
6-3=
3
45-9=
60-30=
30
Mme Underwood had 20 students in her classroom. 11 of those students were boys. How many girls did Mme Underwood have in her class?
Mme Underwood had 9 girls in her classroom.
50-20=
30
9-6=
3
50-9=
41
20
Charlie measured 66 cm's in September. Over several months, Charlie grew to 80 cm's. How many centimeter's did Charlie grow by?
Charlie grew by 14cms.
100-50=
50
7-5=
2
46-7=
39
99-11=
88
Norah had 100 beanie boos. Her parents told her she had to give away 53 beanie boos. How many beanie boos does Norah have left?
Norah has 47 beanie boos left.