7 + - 8 =
-1
12 x 7
84
32
9
(4 + 12) + (10 - 6) =
= 16 + 4
= 20
3 x 5 = 15
Write a number sentence using inverse operation.
15 ÷ 3 = 5
15 ÷ 5 = 3
-3
648 ÷ 4 =
162
√36
6
42 - 6 + 10 =
42 - 6 + 10 =
= 16 - 6 + 10
= 10 + 10
= 20
(14 + 14 + 10) x 3 = 114
-3 + - 4 =
-7
1425 ÷ 100 =
14.25
22 + √ 25 =
22 + √ 25 =
= 4 + 5
= 9
(√ 25 x 10 + 20) ÷ 7 =
(√ 25 x 10 + 20) ÷ 7 =
= (5 x 10 + 20) ÷ 7 =
= 70 ÷ 7
= 10
thgie rebmun eht etirw
8
-14 + - 23 =
-27
425 x 24 =
10,200
√144 + 42 =
√144 + 42 =
12 + 16 = 28
(20 + 15 - 10) ÷ 5 =
-8 + 4 + -6
-10
132 x 8 ÷ 4 =
264
√225 + 52 =
√225 + 52 =
= 15 + 25
= 40
((102 - √ 81) + 32) ÷ 5 =
((102 - √ 81) + 32) ÷ 5 =
= ((100 - 9) + 32) ÷ 5
= (91 + 32) ÷ 5
= (91 + 9) ÷ 5
= 100 ÷ 5
= 20
Which operations are commutative?
(3 x 4 = 4 x 3)
(15 + 20 = 20 + 15)