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Tsehay
Answers (1)
12 + 40 = 52 You make the biggest addend the next ten number. In this case, the biggest addend is 37 which we are gonna make the next ten. To do so you add three. Here, you take the 3 from 15. So you deduct 3 from 15 and add it to 37, which makes 12 + 40 =
