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Mathematics for IGCSE & O level - Estimation (Section 4 - No. 9)

What is the approximate area of a rectangle with a length of 7.8 cm and a width of 4.2 cm (rounded to 1 s.f.)?
28 cm²
32 cm²
30 cm²
36 cm²

Объяснение

7.8 * 4.2 ~ 8 * 4 = 32

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