Learning how to add and subtract by using place values is a first grade, Common Core math skill: 1.NBT.4. Below we show two videos that demonstrate this standard. Then, we provide a breakdown of the specific steps in the videos to help you teach your class.
Your students should be familiar with counting from 1 to 100 using 1’s and 10’s, starting from any number. They should also be able to read, write, and represent objects using numbers between 0 and 20 (K.CC.1-3).
Later on, understanding place values will enable your students to skip-count within 1000 (counting by 5’s, 10’s, and 100’s). They will also be able to read and write numbers by using “base ten numerals, number names, and expanded form” (2.NBT.1-3).
Common Core Standard: 1.NBT.4 - Add within 100, both one and two-digit numbers and multiples of 10; use concrete models, drawings, and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 1.NBT.4
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Different Methods to Add Large Numbers
This video demonstrates three different ways to solve adding two large numbers together. The girl in the video is confused because she at first does not know how to solve 43 + 21. Then, she remembers 3 different methods she learned in school for how to solve these types of problems.
The first method uses blocks to solve the equation.
The next example follows the same pattern, except without blocks for aid.
The last example uses a number line to solve the equation.
The video ends by reminding students that they can add large numbers by breaking them into 10s and 1s and using a number line.
Video 2: Adding Large Numbers in Columns
The video begins by doing a brief review on place values and what they are: “A place value shows the position of a digit in a number.” For example, if a number has 6 tens and 2 ones, then the number is 62.
Boddle then explains that place values can be used to make addition and subtraction easier. The video then provides a few examples for students to see how the concept works.
The video then gives another example: 35 + 7. It demonstrates how students can handle an addition equation that carries a new number over into the 10s place.
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*Information on standards is gathered from The New Mexico Public Education Department's New Mexico Instructional Scope for Mathematics and the Common Core website.