First multiply 2 x 5 = 10. Then multiply 10 x 7 = 70. But since everything is multiplication, you can actually multiply in any order you want. For example 5 x 7 = 35, then multiply 35 x 2 = 70.
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2 x 2 x 5 x 5 x 7
140 = 2 x 2 x 5 x 7 = 22 x 5 x 7
The two numbers are 5 and 2. 5 + 2 = 7 5 x 2 = 10
2 x 5 x 7 = 70
The lowest common multiple of 5, 2, and 7 is 70