Mental Math

Addition

100

55 + 25 = ?

80

200

34 + 35 = ?

69

300

34 + 43 = ?

77

400

159 + 21 = ?

180

500

? + 36 = 101

65

Subtraction

100

35 - 15 = ?

20

200

21 - 9 = ?

12

300

64 - 46 = ?

18

400

143 - 8 = ?

135

500

500 - ? = 109

391

Fractions

100

2/7 + 3/7 = ?

5/7

200

7/8 - 4/8 = ?

3/8

300

25/3 - 12/3 = ?

(do not simplify)

13/3

400

2/2 + 3/3 - 5/5 = ?

1

500

4/6 + 12/6 =

(answer will be a mixed number)

2 2/3

Decimals

100

1.1 - 1 = ?

.1

200

18 - .8 = ?

17.2

300

.5 + .2 + .4 = ?

1.1

400

5.3 + 3.1 - .3 = ?

8.1

500

17 - .19 = ?

16.81

Story Problems

100

Lexi has one hundred bananas and Camden has nineteen bananas. How many bananas do they have combined?

119 bananas

200

Paxton has nine toys. Ryder came and took a toy away. How many toys does Paxton have now?

8 toys

300

Peyton's mom made a pumpkin pie. Peyton ate 3/4 of the pie. How much of the pie is left?

1/4

400

Lexi, Camden, Paxton, Ryder, and Peyton all wanted to share a pumpkin pie. How much of the pie does each person get? 

1/5

500

Teddy has $29.54. There is a sale going on at the bookstore. The book Teddy wants went from $30.00 to $23.00. How much did the price of the book drop to? How much money will Teddy have left over after he buys the book?

$7.00

$6.54