Section 26.3 Deliberate Practice: Subtraction Practice
Algebra is a skill, which means it requires practice to become proficient. But it will take more than rote repetition to get there. Deliberate practice is the thoughtful repetition of a task. For each of these sections, you will be given a list of specific skills or ideas to focus on as you practice thinking through the problems.
Focus on these skills:
Do the problem mentally before drawing any part of the number line diagram.
Draw out the steps of subtracting the different place values on the number line diagram.
Present your work legibly.
Worksheet Worksheet
Instructions: Perform the given calculation mentally, then draw out a number line diagram to perform the calculation.
1.
Calculate \(48 - 23\) mentally and on a number line.
2.
Calculate \(75 - 38\) mentally and on a number line.
3.
Calculate \(62 - 15\) mentally and on a number line.
4.
Calculate \(53 - 47\) mentally and on a number line.
5.
Calculate \(61 - 28\) mentally and on a number line.
6.
Calculate \(83 - 71\) mentally and on a number line.
7.
Calculate \(48 - 29\) mentally and on a number line.
8.
Calculate \(378 - 227\) mentally and on a number line.
9.
Calculate \(283 - 149\) mentally and on a number line.
10.
Calculate \(314 - 178\) mentally and on a number line.