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Borrowing from the tens:

Now, remember, that's really
70
= 60
+ 10!
Remember the big key:
|
A
1 in the tens
stripe is 10...
and that's the same as 10 ones! |

Now, add the 10
and the 5
in the ones stripe:

See if you can finish it, then go to the next page to see how you did!
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