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Standards/Math/Northern Mariana Islands/1.NBT.B.2

1.NBT.B.2

1.NBT.B Understand place value.
1.NBT.B.2
1.NBT.B.2.a1.NBT.B.2.b1.NBT.B.2.c
1.NBT.B.3

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

1.NBT.B.2.a10 can be thought of as a bundle of ten ones — called a "ten."1.NBT.B.2.bThe numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.1.NBT.B.2.cThe 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).
Khan Academy Resources
Tens and onesGroups of ten objects2-digit place value challengeIntro to place value
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