Mental Math Jeopardy

Multiplication I.

100

12 x 7

84

200

340 x 7

2,380

300

17 x 20

340

400

340 x 52

17,680

500

107 x 893

95,551

Multiplication II.

100

24 x 8

192

200

251 x 4

1,004

300

24 x 25

600

400

279 x 386

107,694

500

856 x 789

675,384

Squaring Numbers I.

100

25²

625

200

65²

4,225

300

54²

2,916

400

107²

11,449

500

89²

7,921

Squaring Numbers II.

100

15²

225

200

53²

2,809

300

56²

3,136

400

92²

8,464

500

34²

1,156

Calculating Percentages

100

What is 10% of 20?

2.0

200

What is 10% of 97?

9.7

300

What's 20% of 30?

6.0

400

What is 20% of 87?

17.4

500

What is 15% of 36?

5.4