![]() To read the resulting number, count the number of base ten blocks left in each pile and read the number. Trade any groups of 10 rods for a flat then trade any groups of 10 flats for a block. Next, trade any groups of 10 cubes for a rod. Put all of the cubes from both numbers in the same pile do this with the rods, flats, and blocks as well. To add two or more numbers, start by representing each number with base ten blocks. One simple use of base ten blocks that translates well to a paper and pencil method of addition is to add by regrouping. ![]() A block looks like ten flats piled one on top of the other and bonded together. A flat looks like one hundred cubes place in a 10 x 10 square and attached together. Flats, as you might have guessed, represent hundreds, and blocks represent thousands. Rods represent the tens place and look like ten cubes placed in a row and fused together. Cubes represent the ones place and look exactly like their name suggests - a small cube usually one centimeter by one centimeter by one centimeter. In this example, the place value of the ones place is 5.īase ten blocks turn the base ten concept into something children can see and touch.īase ten blocks consist of cubes, rods, flats, and blocks. The only possible digits that could go in each place are the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. For example, in the number 345, there is a hundreds place, a tens place and a ones place. This essentially means that you can only use ten unique digits (0 to 9) in each place of a base ten number. My goal with this website is to share teaching ideas that will strengthen your teaching and provide materials that will simplify your life.The numbering system that children learn and the one most of us are familiar with is the base ten system. I’m thrilled you’re here! I am a teacher blogger and an education curriculum creator. These 2-Digit Addition activities are for second grade. I have created a few activities in ready-made Google Slides. 2NBT Worksheets (with digital access)- Covers ALL NBT skills, but includes a few regrouping practice pages.2NBT5: 2-Digit Addition and SubtractionĪnd here are extra supplemental resources to fit into your lessons as you see fit.Here are two full units with guided lesson plans, hands-on centers, differentiated small group activities, and more. ![]() I have two options for regrouping activities: full units with lesson plans and supplemental activities to fit into your own lessons. Suggested Regrouping Materials for Practice In addition, they get more practice with the strategies as they check their work. This allows them to connect each strategy to the overall skill of regrouping. Furthermore, it is good practice to have students use two different strategies to check their work, such as the standard algorithm and base-ten. Teaching students how to check their work is an important skill. 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. NBT.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. NBT.6: Add up to four two-digit numbers using strategies based on place value and properties of operations. NBT.5: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. In 2nd grade, students will be introduced to base-ten blocks, expanded notation, and the standard algorithm as strategies for regrouping. These strategies will help students fluently add and subtract using place value and properties of operations. This blog post is full of tips for teaching your 2nd grade students about regrouping strategies.
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