In this math video I (Susanne) explain how to find the number ABCD, that is multiplied by 4 gives us DCBA. We use long multiplication to solve this problem and think about the carry during multiplication. Mathematics explained.
00:00 Intro – Math puzzle
0:30 Multiplication by 4
2:00 Finding A
4:24 Finding D
5:50 Finding B
8:37 Finding C
11:10 See you later!
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