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KEY CONCEPT OVERVIEW - Baltimore City Public Schools

Use a number bond to make a ten when adding numbers up to 100; for example, 38 + 7 can be thought of as 38 + 2 + 5, and from there, we can make the simpler problem, 40 + 5. Use a number bond to take from ten when subtracting numbers up to 100; for example, 67 – 9