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Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects,

drawings, and equations with a symbol for the unknown number to represent the problem. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Understand
and apply properties of operations and the relationship between
addition and subtraction.

Apply
properties of operations as strategies to add and subtract. +, - Fact Families (EZ School)

Understand subtraction as an unknown-addend problem.subtract 10 – 8 by finding the number that makes 10 when added to 8

Subtraction Harvest (Sheppard)

Add and subtract within 20, demonstrating fluency for addition andsubtraction within 10. Use strategies such as counting on; making ten

(e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Create Fact Families (sadlier-oxford)

Fill in Fact Families (sadlier-oxford)

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? – 3, 6 + 6 = ?.

Understand
that the two digits of a two-digit number represent amounts

of tens and ones. Understand the following as special cases:

Partition Numbers (ictgames.com)

10 can be thought of as a bundle of ten ones — called a “ten.”

Matching Numbers and Blocks (sadlier-oxford)

Base Ten Block Matching (ict games)

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones). Compare two two-digit numbers based on meanings of the tens and onesdigits, recording the results of comparisons with the symbols >, =, and <. thatquiz.com (>,<,=)

Add
within 100, including adding a two-digit number and a one-digit

number, and adding a two-digit number and a multiple of 10, using
concrete models or drawings and strategies based on place value,
properties of

operations, and/or the relationship between addition and subtraction;

relate the strategy to a written method and explain the reasoning
used.

Understand that in adding two-digit numbers, one adds tens and tens,
ones

and ones; and sometimes it is necessary to compose a ten.

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

10 Less Shoot Out (ict)

Octopus Game [+10] (ictgames.com)

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

Order three objects by length; compare the lengths of two objects indirectly by using a third object.

Express
the length of an object as a whole number of length units, by laying
multiple copies of a shorter object (the length unit) end to end;
understand that the length measurement of an object is the number
of same-size length units that span it with no gaps or overlaps.
Limit to contexts where the object being measured is spanned by
a whole number of length units with no gaps or overlaps.

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

Clock Shoot-Level 2 (Sheppard)

Organize,
represent, and interpret data with up to three categories; ask and
answer questions about the total number of data points, how many
in each category, and how many more or less are in one category
than in another.

Starfish Theater (Interpret Pictographs)

Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes. Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape. Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

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