# Unknown Parts (basic algebra) Subtraction - Lesson for Grade 2, Chapter - Thinking Deeper about Addition and Subtraction—The Unknown Number

Estimated classroom time: 13 min
Unit: Applications in Operations Within 1000
Click on any activity below to start learning.
1st
3:00 min
Number Bonds in an Ecosystem Worksheet
worksheet
2nd
3:00 min
A Banker's Unknown Numbers Worksheet
worksheet
3rd
3:00 min
The Levels of Equal Matter Worksheet
worksheet
4th
4:00 min
Unknown Parts Addition and Subtraction Equations
Quiz
Share your lesson with students by clicking:
• ### Activity 1 / Number Bonds in an Ecosystem Worksheet

Use the colorful and attractive images in this mathematical worksheet to teach your kids. If you feel that your kids could use some help in the mathematical department, then this printout is just what you need to get their solving skills geared up. There are four different images in the picture. Ask your kids to look at each number bond, and then use subtraction to find the missing number. Help them solve and check the correct equation.

• ### Activity 2 / A Banker's Unknown Numbers Worksheet

In a bank, it is the banker’s job to make sure that all of the money is accounted for, and properly counted. If there is a shortage of money, or finances are improperly recorded, it can lead to a huge loss and trouble for the banker. In this worksheet, your kids will be counting the money at a bank. Ask them to look at the equations given. Solve the simple equations with your kids, and then help them circle the correct answer.

• ### Activity 3 / The Levels of Equal Matter Worksheet

What is matter? Do your kids know what matter is, and can they explain it to your satisfaction? Teach your kids that matter is anything that has weight and occupies space. This means that matter is everything. Give your kids some common examples of matter such as people, animals, objects, and even liquids. Now, look at the levels of matter in this worksheet. Ask your kids to solve the mathematical problems beneath them by circling the number that completes the number sentence.

• ### Activity 4 / Unknown Parts Addition and Subtraction Equations - Quiz

This quiz assesses students’ ability to solve basic algebraic addition and subtraction equations.

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