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it means to break it down
3 x 7 = 21 Not sure what is meant by 'break apart' in the question?
To break apart ones to make a ten, you can use the concept of place value. For example, if you have the number 8, you can break it into 5 and 3 to make a ten. This is because 5 + 3 = 8. By understanding the relationship between numbers and their parts, you can easily break apart ones to form a ten.
when you to add
18 + 5 =