Answer:
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21) 31 + 14
22) 16 - 9
23) 7 + 4 + 18
24) 3 × 40
25)
26) 81 ÷ 3 OR 81/3 (the fraction bar also means divide)
27) 3 × 2 = 6
28) 7 x 6 = 42 (7 days in a week times by 6 weeks equal 42 days)
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