Mental Math: Addition and Subtraction

Addition

5

Add 25 +10.

What is 35?

10

Add 49 + 30.

What is 79?

15

Add 46 + 5.

What is 51?

20

Add 28 + 9.

What is 37?

25

Add 44 + 35.

What is 79?

Subtraction

5

Subtract 63 - 10.

What is 53?

10

Subtract 85 - 70.

What is 15?

15

Subtract 85 - 41.

What is 44?

20

Subtract 67 - 24.

What is 43?

25

Subtract 73 - 23?

What is 50?

Story Problems

5

Henry is 10 years old. His father is 43 years old. How much older is Henry's father than Henry?

What is 33?

10

Julie baked 48 cupcakes for her party. The guests ate 25 of them. How many cupcakes are left?

What is 23?

15

BONUS!! (worth 20 points) 

Tammy read for 21 minutes one evening. Over the weekend, she read for 52 minutes. How many minutes did Tammy read altogether?

What is 73?

20

Kristin bought 49 CD's at the store. She got 5 more from her friend. How many CD's does Kristin have now?

What is 54?

25

George counted 65 raisins in the box. He ate 43 of them. How many raisins are left?

What is 22?

More Story Problems

5

Rusty ate 13 cat treats. Then he ate 12 more. How many cat treats did Rusty eat?

What is 25?

10

Princess slept for 19 hours. Socks slept for 16 hours. How much longer did Princess sleep than Socks?

What is 3 hours?

15

Henry had 29 balloons for his birthday. 16 of the balloons floated away. How many balloons does Henry have now?

What is 13?

20

Mrs. Antley's class has 24 students. Mrs. Cartwright's class has 25 students. How many students are in both classes?

What is 49?

25

BONUS!! (worth 20 points) 

Ms. Blackwood has 30 minutes for lunch. She finished eating in 19 minutes. How much time does Ms. Blackwood have left of her lunch?

What is 11 minutes?