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(9) 5 * 21 * 12 cm³ = 1260 * 1 cm³  Choose (3)

(10) 24 * 32/2 cm² = 384 cm² Choose (4)

(11) 3/8 * u/7 = 3/14                 If u is the missing number, multiply both sides by 14

3u/4 = 3                 multiply both sides by 4

u = 4                        Choose (4)

 

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