Subtraction
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# Subtraction

lessons, activities, and strategies for helping students with subtraction
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## Math for 3rd Grade

Jennifer Callaway's insight:

So this was a really neat idea. The math is CC aligned, and it also incorporates technology. However I'd probably make the QR code on the back so that with a quick glance at the center I'd be able to see if they were just using the QR codes to find all the answers or if they were solving first. I'd also have to take out the cards that are too hard.

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## Halloween Subtraction Scavenger Hunt: 3 digit subtraction with regrouping

This 10 page download includes everything you need to implement a Halloween themed subtraction scavenger hunt in your classroom. Students will solve 12 word
Jennifer Callaway's insight:

This a great ineractive activity for subtraction! I also love the fact that it is word problems and not just a worksheet. I could definitely modify this to be a different theme depending on the time of year I was teaching the concept. I like the combination of the scavenger hunt and the actual independent practice of the activity.

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## Subtraction in pairs

This is an activity my mentor did with her class.

Materials: paper, white boards or transperencies, dry erase markers, scissors/cutting board, small plastic bags

1. create a table on a word doc with 2 columns and 20 rows.

2. put a 4 digit number in each on of the forty boxes (this will create about             2-3 pages depending on the size of your boxes

3. get some colorful paper and print out a set of pages for the number of               groups you have in your class. (For example, we have 27 students so we         made 14 copies so that each group of 2 students had a set)

4. cut each set of 2-3 pages into the boxes of just the numbers and place             them in a baggy.

5. break students into groups of 2 and give each group a baggy.

6. have students take a white board and dry erase marker (transperencies             make great white boards with a sheet of paper inside them)

7. tell the students to shake the numbers in the bag and for each student to         pull out one number

8. tell students that once two numbers have been pulled, put the bigger one           on top and use the white board to do subtraction with the two numbers

9. when students have gone through all the numbers they can put the numbers     back in the bag, shake, and play again with different numbers.

Jennifer Callaway's insight:

this is an independent work activity for math class to let students practice subtraction. Works for any grade level, just modify the instruction of # of digits when creating the numbers.

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## 3rd Grade Grapevine: How to Subtract the Common Core Way

Jennifer Callaway's insight:

I really liked this blog post. This teacher explains what she is doing and why. It is really relevant to me as a 3rd grade intern and shows ways I can visualize subtraction for my students. We use a lot of anchor charts in my classroom so this is something I can definitely make.

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## math articles

Jennifer Callaway's insight:

this was a cute video with the students explaining a math strategy. Great as an example of peer instruction/explanation in the classroom. The strategy is also CCSS aligned.

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## Second Grade Math

Jennifer Callaway's insight:

I love this subtraction poem! My school has been using the "3 b ranch" - if the bottom number is bigger than borrow. However, I like this more, it's a little bit longer but it is catchy, and it includes what to do when there is a 0. I definitely plan to use this later in the year to help my kids remember what to do when regrouping.

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## Real World Math

You can try this simple activity with your third grader to get him thinking about the real world math you use everyday.
Jennifer Callaway's insight:

I love this activity. This is really similar to something we talked about in class. I'm planning to work with my students on 3 and 4 digit subtraction where you have to regroup. A lot of a grocery store items aren't as expensive and my kids haven't done decimal places yet, so a bestbuy ad would work great!

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