True: 4.2 x 5.1 is approximately 20, 3.8 x 2.9 is approximately 12, 99 x 11 is approximately 1000, 0.993 + 1.022 is approximately 2, 3.1 x 10.01 is approximately 30, 4.09352 + 21.0623 is approximately 25,

estimation and approximation true or false

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