Monday

Using only the operations of addition and subtraction, write down the other calculations for the following:

Example: If 12 + 8 = 20

Then 8 + 12 = 20

So 20 – 12 = 8

Therefore 20 – 8 = 12

If 72 + 23 = 95

Then

So

Therefore

If 32 + 48 = 80

Then

So

Therefore

If 120 - 56 = 64

Then

So

Therefore

If 1,928 +  2,547 = 4, 475

Then

So

Therefore

If 15, 643 + 4, 321 = 19, 964

Then

So

Therefore

If 123, 213 + 8, 999 = 132, 212

Then

So

Therefore

Work out the question mark for the following:

? – 64 = 28

28 + 64 = ?

? – 25 = 32

32 + 25 = ?

? + 82 = 1, 727

1, 727 - 82 = ?

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