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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.
Solve problems that call for addition of three whole numbers whose sum is within 20.
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).
Add within 100.
Add or subtract a multiple of 10 from another two-digit number, and justify the solution.
1.GM.B.5 Order three or more objects by length.
1.GM.B.6 Compare the lengths of two objects indirectly by using a third object.
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