choko is

X

100

3X7

=21

200

6X8

=48

300

300X7

=2100

400

77X9

=693

500

99X99

=9801

+

100

20+17

=37

200

88+5

=93

300

400+600

=1000

400

610+95

=705

500

784+784

=1568

:

100

8:4

=2

200

9:2 med rast

=4,5

300

20:5

=4

400

700:5

=140

500

7000:4

=1750

-

100

28-6

=22

200

789-28

=761

300

100-48

=52

400

741-28

=713

500

1200-600

=600

det blandede

100

3-2X6+2

=8

200

7X5-6

=29

300

7X8X9-15+3

=492

400

7+8+9+1

=25

500

1+1

=2