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Other Fluency Activities related to this standard
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1 Content Standard is aligned with this activity
Major StandardsSupporting StandardsAdditional Standards
Standard 1.NBT.C.5Given 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
Prerequisites for 1.NBT.C.5
1st Grade
1.NBT.B.2Understand 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).
Upcoming Standards for 1.NBT.C.5
The Understood offers evidence-based strategies that benefit all students, especially those with learning differences and attention issues.
