Show:
Gange
Reducering
Tabeller
Division
Plus/minus
100

4·3 =

12

100

a+a+b =

2a+b

100

Sig 2-tabellen

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

100

6:2=

3

100

25+25=

50

200

7·7 =

49

200

3a+b+2b=

3a+3b

200

Sig 4-tabellen

4, 8, 12, 16, 20, 24, 28, 32, 36, 40

200

12:3=

4

200

50-26=

24

300

8·9=

72

300

5a+12b+7c+4a+c =

9a+12b+8c

300

Sig 7-tabellen

7, 14, 21, 28, 35, 42, 49, 56, 63, 70

300

35:5=

7

300

35+39=

74

400

7·11=

77

400

11a+9b+3c+8b+3a=

14a+17b+3c

400

Sig 8-tabellen

8, 16, 24, 32, 40, 48, 56, 64, 72, 80
400

48:6=

8

400

111+97=

208

500

9·9 =

81

500

13a+25b+22c+4b+41a=

54a+29b+22c

500

Sig 9-tabellen

9, 18, 27, 36, 45, 56, 63, 72, 81, 90

500

36:3

12

500

294-193

101