MENTAL MATH - INVEST 6 to LESSON 70

Question 1

Count up and down by 1/4’s between 1/4 and 4.

Answer 1

1/4, 1/2, 3/4, 1. 1 1/4, 1 1/2, 1 3/4, 2, 2 1/4, 2 1/2, 2 3/4, 3, 3 1/4, 3 1/2, 3 3/4, 4

Question 2

4 x 750

Answer 2

3000

Question 3

283 + 250

Answer 3

533

Question 4

750 - 199

Answer 4

551

Question 5

$8.25 - $2.50

Answer 5

$5.75

Question 6

Double 12 1/2

Answer 6

25

Question 7

900/30

Answer 7

30

Question 8

6 x 10, ÷ 3, x 2, ÷ 4, x 5, ÷ 2, x 4

Answer 8

100

Question 9

Count by 12’s from 12 to 144

Answer 9

12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144

Question 10

5 x 40

Answer 10

200

Question 11

475 + 1200

Answer 11

1,675

Question 12

3 x 84

Answer 12

252

Question 13

$8.50 + $2.50

Answer 13

$11.00

Question 14

1/3 of $36.00

Answer 14

$12.00

Question 15

$25/10

Answer 15

$2.50

Question 16

6 x 8, - 4, ÷ 4, x 2, + 2, ÷ 6, ÷ 2

Answer 16

2

Question 17

Hold your hands 1 foot apart

Answer 17

Yay, you did it!

Question 18

Count up and down by 1/8’s between 1/8 and 2.

Answer 18

1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1 1/8, 1 1/4, 1 3/8, 1 1/2, 1 5/8, 1 3/4, 1 7/8, 2

Question 19

5 X 140 (10 X 140 ÷ 2)

Answer 19

700

Question 20

420 - 50

Answer 20

370

Question 21

4 X 63

Answer 21

252

Question 22

$8.50 - $2.50

Answer 22

$6.00

Question 23

Double 7 1/2

Answer 23

15

Question 24

$25/100

Answer 24

$0.25

Question 25

5 x 10, - 20, + 2, ÷ 4, + 1, ÷ 3, -3

Answer 25

0

Question 26

Hold your hands one foot apart, then one inch apart.

Answer 26

Wow, look at you!

Question 27

Count up and down by 25’s between 25 and 300.

Answer 27

25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300

Question 28

5 x 240

Answer 28

1200

Question 29

4500 + 450

Answer 29

4,950

Question 30

7 x 34

Answer 30

238

Question 31

$7.50 + $7.50

Answer 31

$15.00

Question 32

1/4 of $20.00

Answer 32

$5.00

Question 33

$75/10

Answer 33

$7.50

Question 34

6 x 8, ÷ 2, + 1, ÷ 5, - 1, x 4, ÷ 2

Answer 34

8

Question 35

Hold your hands one foot apart, then one yard apart.

Answer 35

You sure about that?

Question 36

Count by 9’s from 9 to 108

Answer 36

9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108

Question 37

5 x 60

Answer 37

300

Question 38

586 - 50

Answer 38

536

Question 39

3 x 65

Answer 39

195

Question 40

$20.00 - $2.50

Answer 40

$17.50

Question 41

Double $0.75

Answer 41

$1.50

Question 42

$75/100

Answer 42

$0.75

Question 43

9 x 9, - 1, ÷ 2, + 2, ÷ 6, + 3, ÷ 10

Answer 43

1

Question 44

Hold your hands one yard apart, then one meter apart.

Answer 44

Yep, a yard is 3 feet, and a meter is a smidge more. Nice!