Rolling on the Number Line (Whole-Number Subtraction)
2.MD.2.6 - Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.
2.NBT.2.5 - Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.2.7 - Add and subtract within 1000, 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. Understand that in adding or subtracting three digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
Objective: Students will be able to represent whole-number differences on a number line diagram.
Materials: Rolling on the Number Line worksheet, pair of number cubes, and a pencil.
1. Students will work individually or in pairs.
2. Each student will get a Rolling on the Number Line worksheet and pair of number cubes.
3. Students will roll a pair of number cubes to generate numbers for each question.
4. Students can use one number cube per box or sum the two number cubes per box for a greater challenge.
5. Once students have done this for each box, they will model each problem on the number line and solve.
Note: When filling in the boxes, the larger number should be in the first box otherwise your solutions will result in negative values.
Time: 15 minutes