3 x 7 = 21
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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.
331
21
3 times -7 is -21
seven seven