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100

2/5 + 4/5

= 6/5

100

3/2 − 1/2

= 1

100

8/7 ⋅ 7/10

= 56/70 = 4/5

100

−1/5 ÷ 7/4

= -4/35

200

(-10/7 ) + 1/6

-53/42

200

2 − 13/8

= 3/8

200

− 2/3 ⋅ 5/4

= − 5/6

200

1/2 ÷ 8/7

= 7/16

300

9/5 + (− 4/3)

= 7/15

300

1/3 − ( − 5/3)

= 2

300

−2 ⋅ 3/7

= − 6/7

300

−9/5 ÷ 2

−2 ÷ −3 4/5

400

(− 1/3) + 3/8 

=1/24

400

(− 4/5) − 7/8

= − 67/40

400

−1 1/4 ⋅ 9

= −11 1/4

400

1/9 ÷ −1 1/3

= − 1 1/2

500

(−1 3/4) + (−3 3/4)

−5 1/2

500

(−3 3/5) − 4 2/5

= -8

500

−1 5/7 ⋅ −2 1/2

= 4 2/7

500

−3 7/10 ÷ 2 1/4

= −1 29/45

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