- 1.NBT.C.5

Major StandardsSupporting StandardsAdditional Standards

Standard 1.NBT.C.5### Prerequisites for 1.NBT.C.5

### 1st Grade

### Upcoming Standards for 1.NBT.C.5

### 2nd Grade

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Part of Major Cluster 1.NBT.C

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

10 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).

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