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Compose and decompose two-and three-dimensional shapes to build an understanding of part-whole relationships and the properties of the original and composite shapes.
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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