Question

Select the best estimate that would help you check the answer to 778 x 23 A 700 30 OB 700 x 20 C 800 20 OD 800 x 30

Answer 1

`\begin{gathered} 778\cdot23=17,894 \\ 700\cdot30=21,000 \\ 700\cdot20=14,000 \\ 800\cdot20=16,000 \\ 800\cdot30=24,000 \end{gathered}`

800 x 20 = 16,000 is closest to 17,894

Therefore, the best estimate is Option C, 800 x 20