"Addition and Subtraction of Fractions with Different Denominators" PPT

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"Addition and Subtraction of Fractions with Different Denominators" PPT

Part One: Analysis of Examples

Example 1: Yaya and Honghong use the same size colored paper to make origami flowers.

(1) How many pieces of paper did they use in total?

Can we add directly if the denominators are different?

First, use the lowest common multiple of 2 and 3 as the common denominator...

(2) How many more pieces of paper did Honghong use than Yaya?

Try doing the math yourself.

To add and subtract fractions with different denominators, you must first add and subtract them.

Example 2: A certain city implemented a three-year "conversion of farmland to forest" project. In the first year, 2/5 of the plan was completed, in the second year, 3/10 of the plan was completed, and in the third year, 2/5 of the plan was completed. What fraction of the plan has been completed in three years?

What does it mean to complete the planned 11/10?

Addition and subtraction of fractions with different denominators PPT, Part 2: Consolidation exercises

1. Is the following calculation correct? Correct what is wrong.

(1)1/3+1/2=2/5

(2)8/15-1/3=3/15

An orchard needs to be planted with peach trees, apple trees and pear trees. The peach trees and pear trees account for 13/16 of the total area, and the apple trees and pear trees account for 5/8 of the total area. What fraction of the total area does the pear tree occupy?

The area of ​​the apple tree: 1-13/16=3/16

Area of ​​peach tree: 1-5/8=6/16

Area of ​​pear tree: 1-3/16-6/16=7/16

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Hebei Education Edition Fifth Grade Mathematics Volume 2 industry PPT template

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