Math Challenge

Addition

100

10+11=

21

200

24+43=

67

300

35+15=

50

400

128+140=

268

500

507+243

750

Subtraction

100

17-5=

12

200

85-32=

53

300

70-14=

56

400

345-123=

222

500

450-136=

314

Multiplication

100

4x6=

24

200

7x6=

42

300

3x12=

36

400

15x4=

60

500

21x32

672

Division

100

10/2=

5

200

15/5=

3

300

24/3=

8

400

21/3=

7

500

60/15=

4

Variables

100

7+b=15

b=8

200

25-x=13

x=12

300

5xB=45

B=9

400

80/y=8

y=10

500

2x+x+5=26

x=7