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Month: September 2021

Place Value Operations to Add and Subtract 1st , Activity: 272

1st Grade, Activity: 272: Use Place Value Understanding and Properties of Operations to Add and Subtract

September 22, 2021
1st Grade Sheets, Worksheets

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

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Compare two-digit numbers

1st Grade, Activity 247: Understand Place Value

September 22, 2021
1st Grade Sheets, Worksheets

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results
of comparisons with the symbols >, =, and <.

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Problem Solving of Addition and Subtraction

1st Grade, Activity 9: Represent and Solve Problems Involving Addition and Subtraction

September 21, 2021
1st Grade Sheets, Worksheets

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)

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