Multiplication Grid
Area
Divisions
Solve mentally
Addition and subtraction
100

5×5

25

100

If I have a square of 6cm of side

How much is this area?

24

100

15/3

5

100

60+60

120

100

16+16

32


200

8×9

72

200

If I have a rectangle of 6 of length and 7 of width

How much is the area?

42


200

120/3

40

200

700+700

1,400

200

31-19

12


300

11×12

132

300

If I  have a rectangle of 11 of length and 12 of width . 

How much is the area ?

132

300

1000/5

200

300

12x13

156

300

322-21

301


400

13×13

169

400

If a triangle of 5 of side and 4 of height

How much is the area?

10

400

6000000/30

200000

400

40,000/80

500

400

546+75

621


500

21×25

525

500

If I have a triangle of 6 of side and 7 of height

How much is the area?

21

500

34/9

3.77777777778

500

123+456


579

500

1800-812

988

500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
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500
500
500
500
500
500
500
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500
500
500