CCSS Math:

1.NBT.2
1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

1.NBT.2.A
1.NBT.2.A 10 can be thought of as a bundle of ten ones — called a "ten."

1.NBT.2.B
1.NBT.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.

1.NBT.2.C
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).

This number and operations in base ten lesson covers how to rewrite numbers. The lesson includes research-based strategies and strategic questions that prepare students for assessments. In this lesson, students are asked to read the number, represent it in dots if needed, and group the dots into groups of ten. Then, they rewrite the number and interpret it in words.

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### Standard Alignments:

CCSS Math:

1.NBT.2
1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

1.NBT.2.A
1.NBT.2.A 10 can be thought of as a bundle of ten ones — called a "ten."

1.NBT.2.B
1.NBT.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.

1.NBT.2.C
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).

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