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# 1st Grade Common Core Math Worksheets Determine the Unknown Number 1.OA.8

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1st Grade Common Core Addition and Subtraction: Determine the Unknown Number Worksheets (1.OA.8)

The attachment is a packet of five days of worksheets for first grade common core standard 1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers. Each day has two worksheets, designed to be copied front and back. The front page focuses on the standard of the week and the back is a review of previous information. They all contain place value review and word problems, including an area to write an equation and a prompt to use a symbol for the unknown number.

The review concepts this week are:

1.NBT.5 Mentally find 10 more or 10 less than a number

1.OA.7 Understand the meaning of the equal sign and determine if equations involving addition and subtraction are true or false

1.OA.1 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.
Total Pages
10 pages
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Teaching Duration
1 Week
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