Common Core · Mathematics
1.NBT.2c
Grade 1 · Number & Operations in Base Ten
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).
- Official code
- CCSS.MATH.CONTENT.1.NBT.2c
- Short code
- 1.NBT.2c
- Subject
- Mathematics
- Grade
- Grade 1
- Domain
- Number & Operations in Base Ten
More Grade 1 Number & Operations in Base Ten standards
1.NBT
Number and Operations in Base Ten
1.NBT.1
Count to 120, starting at any number less than 120. In this range, read and write...
1.NBT.2
Understand that the two digits of a two-digit number represent amounts of tens and...
1.NBT.2a
10 can be thought of as a bundle of ten ones — called a "ten."
1.NBT.2b
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six,...
1.NBT.3
Compare two two-digit numbers based on meanings of the tens and ones digits, recording...
1.NBT.4
Add within 100, including adding a two-digit number and a one-digit number, and adding...
1.NBT.5
Given a two-digit number, mentally find 10 more or 10 less than the number, without...
1.NBT.6
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90...
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