Alaska Standards. What is a Number Line? Number lines can be used to help with many different ways. The most common ways are for addition and subtraction.

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Study GuideUsing Number Line

Worksheet/Answer keysUsing Number Line

Worksheet/Answer keysUsing Number Line

Worksheet/Answer keysUsing Number Line

AK.1.CC. Counting and Cardinality

Compare numbers.

1.CC.5. Use the symbols for greater than, less than or equal to when comparing two numbers or groups of objects.

Know ordinal names and counting flexibility.

1.CC.3. Order numbers from 1-100. Demonstrate ability in counting forward and backward.

AK.1.NBT. Number and Operations in Base Ten

Extend the counting sequence.

1.NBT.1. Count to 120. In this range, read, write and order numerals and represent a number of objects with a written numeral.

Understand place value.

1.NBT.3. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, <.

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

1.NBT.4. Add using numbers up to 100 including adding a two-digit number and a one-digit number and adding a two-digit number and a multiple of 10.

1.NBT.4.a. Use concrete models or drawings and strategies based on place value; properties of operations; and/or relationship between addition and subtraction.

1.NBT.4.b. Relate the strategy to a written method and explain the reasoning used.

1.NBT.6. Subtract multiples of 10 up to 100.

1.NBT.6.a. Use concrete models or drawings; strategies based on place value; properties of operations; and/or the relationship between addition and subtraction.

1.NBT.6.b. Relate the strategy to a written method and explain the reasoning used.

AK.1.OA. Operations and Algebraic Thinking

Add and subtract using numbers up to 20.

1.OA.6. Add and subtract using numbers up to 20, demonstrating fluency for addition and subtraction up to 10. Use strategies such as

1.OA.6.a. Counting on

1.OA.6.b. Making ten (8 + 6 = 8 + 2 + 4 = 10 + 4 = 14)

1.OA.6.e. Creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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.