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Calculate 10 more or 10 less than a given number mentally without having to count.
1.NBT.A.1 Understand that 10 can be thought of as a bundle of 10 ones – called a “ten”.
1.NBT.A.2 Understand two-digit numbers are composed of ten(s) and one(s).
Use addition and subtraction within 20 to solve problems.
Use properties as strategies to add and subtract.
Distinguish between defining attributes versus non-defining attributes; build and draw shapes that possess defining attributes.
1.RA.B.6 Demonstrate that subtraction can be solved as an unknown-addend problem. 1.RA.C.7 Add and subtract within 20. 1.RA.C.8 Demonstrate fluency with addition and subtraction within 10.
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