A student solves this problem by writing an equation. Which strategy could help check the student’s answer? Check that the sum of the final

Question

A student solves this problem by writing an equation. Which strategy could help check the student’s answer? Check that the sum of the final answer, 12, and 15 is 55. Check that the difference of 55 and the final answer is 12. Check that the sum of the final answer, 27, and 15 is 55. Check that the difference of 55 and the final answer is 15.

in progress 0
Diễm Kiều 6 months 2021-08-01T11:25:45+00:00 1 Answers 16 views 0

Answers ( )

  1. Dulcie
    0
    2021-08-01T11:26:58+00:00
    Reply

    total = green marbles + red marbles + blue marbles

    55 = 15 + 12 + blue marbles

    55 = 27 + blue marbles

    55 – 27 = blue marbles

    28 = blue marbles

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )