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Use properties as strategies to add and subtract.
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.
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.
1.RA.A.3 Develop the meaning of the equal sign and determine if equations involving addition and subtraction are true or false.
1.RA.A.4 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
Distinguish between defining attributes versus non-defining attributes; build and draw shapes that possess defining attributes.
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