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Mathematics, 30.05.2020 02:59 60744

Example on worksheet (subtracting by adding up)

50-29?

29+20=49

49+1=50

20+1=21

50-29=21

My question is where did the 20 come from? can you help me understand this?

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Answers: 3

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Example on worksheet (subtracting by adding up)

50-29?

29+20=49

...

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