Put the missing symbol into the box to make these number sentences correct.
Use the symbols +, −, ×, ÷ and =.
17 ☐ 21 = 38
17 ☐ 3 = 51
57 ☐ 29 = 28
9 ☐ 63 ÷ 7
You can make most of the number sentences below correct by putting in symbols in two different ways.
Find the solutions and explain why some of the sentences have only one solution.
79 ☐ 23 ☐ 56
96 ☐ 3 ☐ 32
52 ☐ 13 ☐ 39
21 ☐ 69 ☐ 90
75 ☐ 25 ☐ 3
4 ☐ 16 ☐ 64
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