Subtracting from a ten-thousands number

General

The students learn to subtract from a ten-thousands number, also known as a multiple of ten thousand.

Standards

CCSS.Math.Content.4.NBT.B.4

Learning objective

Students will be able to subtract to 100,000 from ten-thousands numbers.

Introduction

Have the students solve the math problems.

Instruction

Explain that to solve the problem you first subtract the thousands numbers, then the hundreds numbers, tens numbers and ones values. Afterwards, discuss the different strategies of solving the problem 40,000 - 289. First ask the students how they would solve the problem and then show the strategies used by the children on the board. The students solve the next few problems on their own. Then show the story problem. Explain that you must first determine what kind of problem it is and what numbers you need to make the problem. Then you state the problem and solve it. Discuss the story problem about hair together and have the students solve the following problem on their own.

Check whether students can subtract from a ten-thousands number by asking the following question:
- What method do you use to solve this problem in steps? (60,000 - 893)

Quiz

The students are given ten problems in which they practice abstract problems and story problems.

Closing

Discuss once again the importance of being able to subtract from a ten-thousands number. Then have the students spin the wheel and solve the resulting problem.

Teaching tips

Have students that have difficulty with subtracting from a ten-thousands number first practice subtracting for example 30,000 - 1,000. Then 30,000 - 100, then - 10 and then - 1.

About Gynzy

Gynzy is an online teaching platform for interactive whiteboards and displays in schools.

With a focus on elementary education, Gynzy’s Whiteboard, digital tools, and activities make it easy for teachers to save time building lessons, increase student engagement, and make classroom management more efficient.