Lesson: Part–Whole Bar Models: Numbers up to 100 Elementary School • Mathematics • 2nd GradeMathematics
In this lesson, we will learn how to solve one-step addition and subtraction problems with numbers up to 100 by drawing a part–whole bar model.
Sample Question Videos
Emma is trying to solve this word problem:
There were 41 birds in a tree. 15 of them flew away. How many birds are in the tree now? Emma said the answer was . What did she do wrong? What is the correct answer?
Ethan and Elizabeth were building houses out of blocks. Ethan used 36 blocks. Elizabeth used 51 blocks. How many blocks did they use?
Will the answer be bigger or smaller than the numbers in the question?
Do you need to add or subtract to find the answer?
Find out how many blocks they used.
Benjamin has 62 blocks to build with. He used 29 blocks to build one house. He wants to build a second house with the leftover blocks.
Is the number of leftover blocks bigger or smaller than 62?
Do you need to add or subtact to find how many blocks he has left to build the second house?
How many blocks are left to build the second house?