little lines
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there should be the cm lines- the long ones with the numbers underneath. Inbetween these should be a series of shorter lines indicating the millimetres.
You count them using natural numbers: 1, 2, 3, and so on. If there are 10 lines between the 5 cm mark and the 6 cm mark then each is worth 1/10 cm. Similarly, if there are 16 lines between the 3 inch and 4 inch marks then each line is worth 1/16 inches.
By big, I'm assuming the question is asking for the area. For area, you just need to take the product of those two numbers. A (area) = 7.5 cm x 7.5 cm = 56.25 sq cm
22 cm is approximately 8 and three quarter inches.
(1-cm x 1-cm) = 1 cm2 (4-cm x 2-cm) = 8 cm2 Eight (8) of the little ones will completely cover the big one.