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4 = 3 + 1 so 4 + 9 = (3 + 1) + 9
Then, by the associative property, = 3 + (1 + 9) = 3 + 10 = 13
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How do you make 20-50 with 1 2 3 and 4?
1 add 4 is 5 and 2 add 3 make 5. 5 add 5 make 10 so 2 x 10 is 20
Which factors of 24 add to make 10?
34
How can you make 10 to help you add 5 plus 9?
5 + 9 = 5 + (5 + 4) = (5+5)+4 = 10+4 = 14 Much easier to do in your head than to type out. Practice it. Makes for subtraction much easier once you get the hang of it. ■
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What is the largest product that can be made from positive numbers that add up to 10?
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What is a triangler sequence?
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How do you make six 10's equal to 4?
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