# Common Core Math: Add and Subtract Tens (Grade 1)

Resource Type
Common Core Standards
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3 MB|23 pages
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This file provides a variety of visuals and strategies to understand addition and subtraction of two-digit numbers and multiples of tens in accordance with CCSS 1.NBT.4, 1.NBT.5 and 1.NBT.6. Number grids, base ten blocks and dominoes are used as methods to understand the concepts within these standards.

CCSS.Math.Content.1.NBT.C.4 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.

CCSS.Math.Content.1.NBT.C.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

CCSS.Math.Content.1.NBT.C.6 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.
Total Pages
23 pages
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Teaching Duration
Lifelong tool
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