Alabama 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

AL.NBT. Number and Operations in Base Ten - Students will:

Extend the counting sequence.

NBT.9. Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

Understand place value.

NBT.11. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

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

NBT.12. 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.

AL.OA. Operations and Algebraic Thinking - Students will:

Add and subtract within 20.

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).

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

OA.4. Understand subtraction as an unknown-addend problem.