#### 1.NBT.B.2.a. 10 can be thought of as a bundle of ten ones–-called a “ten.”

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#### 1.NBT.B.2.b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

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#### 1.NBT.B.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).

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#### 1.NBT.C.6. Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

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#### 1.MD.A.1. Order three objects by length; compare the lengths of two objects indirectly by using a third object.

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#### 1.MD.B.3. Tell and write time in hours and half-hours using analog and digital clocks.

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