What is 15 plus 15 plus 15?

Answer 1

15 + 15 + 15 = 45

Another way is to say

3 x 15 = 45 ( Because there are three lots of fifteen added together.

A third way is

15

15

+15

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Add the units column ; 5 + 5 + 5 = 10 + 5 = 15

Place the '5' in the units column and carry into the 'tens column' '1' (from the fifteen).

Hence

15

15

+15

---

XXX 5 Carry '1' in to the tens column.

Hence in the 'tens ' column ; 1 + 1 + 1 + 1(the carry '1') = 4

Hence the full answer is

15

15

+15

---

=45 As before. !!

Answer 2

45

Answer 3

45