Subtraction Facts. First Grade Math Worksheets and Answer Keys, Study Guides and Vocabulary Sets. Iowa Core

◂Math Worksheets and Study Guides First Grade. Subtraction Facts

Study Guide

Subtraction Facts Worksheet/Answer key

Addition and Subtraction Vocabulary/Answer key

Subtraction Facts

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The resources above correspond to the standards listed below:

Iowa Core

IA.CC.1.OA. Operations and Algebraic Thinking

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

1.OA.4. Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. (1.OA.4.) (DOK 2)

Add and subtract within 20.

1.OA.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). (1.OA.5.) (DOK 1,2)

1.OA.6. Add and subtract within 20, demonstrating fluency for addition and subtraction 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). (1.OA.6.) (DOK 1,2)

IA.CC.1.NBT. Number and Operations in Base Ten

Use place value understanding and properties of operations to add and subtract.

1.NBT.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. (1.NBT.4.) (DOK 1,2,3)

Standards

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