Grade 1
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Measurement & Data
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Number & Operations: Base Ten
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Operations & Algebraic Thinking
KAS Math Standard: KY.1.NBT.2.c
The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight or nine tens (and 0 ones).