Mathematics, 05.12.2019 05:31, Maaarii

The problem is 62-30=?

the example gives this problem -

33 - 16 = ?
+4
33 - 20 = 13
+4
33 - 16 = 17

so my question is how to do the 1st problem and in the example, how did they come up with 4 or why did they use 4 in the equation?

Answers: 2

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The problem is 62-30=?

the example gives this problem -

33 - 16 = ?
...