7+21: (15-8) = 60 - (24+3) : 3 = 10*2:5=

50-24: (11-5) = 90 - (28+4) : 4 = 30:10*7=

30+9 * (14-7) = 70 - (56-7) : 7 = 40*10:4=

7+21: (15+8) = 10

1) 15-8=7

2) 21:7=3

3) 7+3=10

50-24: (11-5) = 46

1) 11-5=6

2) 24:6=4

3) 50-4=46

30:10*7=21

1) 30:10=3

2) 3*7=21

30+9 * (14-7) = 93

1) 14-7=7

2) 9*7=63

3) 30+63=93

60 - (24+3) : 3=51

1) 24+3=27

2) 27:3=9

3) 60-9=51

90 - (28+4) : 4=82

1) 28+4=32

2) 32:4=8

3) 90-8=82

70 - (56-7) : 7=63

1) 56-7=49

2) 49:7=7

3) 70-7=63

10*2:5=4

1) 10*2=20

2) 20:5=4

40*10:4=100

1) 40*10=400

2) 400:4=100