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3 x 7 = 21 Not sure what is meant by 'break apart' in the question?
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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.
Math is all about practice. So what a person have to do in math is to keep practicing and do not think about the answer before starting a math problem. Just use the rules and formulas and apply them, what u get at last is the answer. So have no fear.