"Teen" numbers — thirteen through nineteen

I explain how the word "teen" in the "teen numbers" actually refers to ten. For example, fourteen means "four-ten", or ten plus four. Thinking of it that way, these "teen numbers" (thirteen, fourteen, fifteen, etc.) tie in neatly with place value.

We also practice with a hundred-chart, finding numbers ending in 5, whole tens, numbers in the 40s, and such.

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See also

Math Mammoth Place Value 1 — workbook for 1st grade math

Math Mammoth Grade 1 curriculum

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