Add & Subtract within 1000 - Open Number Line

An open number line is a very flexible and versatile tool for helping with adding and subtracting within 1000. It provides visual support allowing students to use or develop their knowledge of place value and rounding in an informal setting.

The worksheets are split into 11 levels of differentiation for both Addition and Subtraction. They start with a 3-digit number plus or minus 100 then progress in steps until both numbers are randomly generated 3-digit numbers. At each level you have an (almost) unlimited number of printable worksheets that could be used throughout the year.

1st number - 3 digits, 2nd number - 100
1st number - 3 digits, 2nd number between 95 and 105
1st number - 3 digits, 2nd number between 90 and 110
1st number - 3 digits multiple of 10, 2nd number - 100 +/ - a multiple of 10 between 10 & 50
1st number - 3 digits, 2nd number - 100 +/ - a multiple of 10 between 10 and 50
1st number - 3 digits, 2nd number - multiple of 100
1st number - 3 digits, 2nd number - multiple of 100 +/ - 5
1st number - 3 digits, 2nd number - multiple of 100 +/ - 10
1st number - 3 digits multiple of 10, 2nd number - multiple of 100 +/ - a multiple of 10 between 10 & 50
1st number - 3 digits multiple of 10, 2nd number - multiple of 100 +/ - a multiple of 10 between 10 & 50
1st & 2nd numbers both 3 digits

An example of the specific level being worked on is generated at the top of each worksheet at the click of a button. Besides being a memory jogger for students, it could be used to introduce the assignment when projected onto an Interactive whiteboard.

Why (almost) Unlimited Worksheets ?
At the click of a button all numbers are randomized, and will therefore change every time so you can create as many different worksheets for classwork, homework, review, preparing for assessments, or just simply practice at any time to keep the skill alive throughout the whole year.

Your students will never run short of new worksheets to practice with.

Full graphical solutions are provided for all worksheets

Note
This resource works with the official Adobe Acrobat Reader on Windows or Mac computers.