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Use addition and subtraction within 20 to solve problems.

Use properties as strategies to add and subtract.

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.

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.

Calculate 10 more or 10 less than a given number mentally without having to count.

Distinguish between defining attributes versus non-defining attributes; build and draw shapes that possess defining attributes.

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.

Tell and write time in hours and half-hours using analog and digital clocks.

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.

Partition circles and rectangles into two or four equal shares, and describe the shares and the wholes verbally.

Demonstrate the ability to measure length or distance using objects.

1.NS.A.1 Count to 120, starting at any number less than 120.

1.NS.A.2 Read and write numerals and represent a number of objects with a written numeral.

Compare two two-digit numbers using the symbols >, = or <.

1.DS.A.1 Collect, organize and represent data with up to three categories.

1.DS.A.2 Draw conclusions from object graphs, picture graphs, T-charts and tallies.