"Abdication and subtraction within 20" PPT courseware 2

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"Abdication and subtraction within 20" PPT courseware 2

minus nine think one

11-9, when you see the subtrahend 9, think of 1, 1 plus the 1 in the ones digit of the minuend is 2, so 11-9=2

Minus eight and think two

11-8, when you see the subtrahend 8, think of 2. Add 2 to the 1 in the units digit of the minuend to get 3, so 11-8=3

minus seven think three

11-7, when you see the subtrahend 7, think of 3. Add 3 to the 1 in the minuend’s ones digit to get 4, so 11-7=4

Subtract six and think four

11-6, see the subtrahend 6 and think of 4, 4 plus the 1 in the minuend’s ones digit is 5, so 11-6=5

I bought a pencil case for 6 yuan, and the salesperson gave me 4 yuan in change. How much did I give the salesperson?

6+4=10 (yuan)

Answer: I originally gave the salesperson 10 yuan.

After eating 6 eggs at home, there are still 8 eggs left. How many eggs were there in the house?

6+8=14 (pieces)

Answer: There were originally 14 eggs at home.

There are 12 apples in the basket. After eating some, 4 are left. How many have been eaten?

12-4=8 (pieces)

Answer: I ate 8.

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For more information about the PPT courseware "Abdication and Subtraction within 20", please click on the Abdication and Subtraction within 20 ppt tag.

"Abdication and subtraction within 20" PPT courseware:

"Abdication Subtraction Within 20" PPT Courseware Learning Objectives: 1. To enable students to learn to calculate abdication subtraction formulas within 20. 2. Be able to perform calculations skillfully and correctly. Put it around and do the math. Which method do you prefer? How else can it be calculated? 9+( )=..

"Subtracting numbers from 16, 17, and 18" PPT courseware for subtraction within 20:

"16, 17, 18 minus a few" PPT courseware for subtraction within 20. Who watered the 16 saplings? I only watered 9 trees, and Xiaohua watered the rest. How many trees did Xiaohua water? 16-9=7 How did you calculate it? Do the math: 16-8= 17-9= 17-8= 18-9= 1..

"Subtract a few from 14 and 15" Subtraction within 20 PPT courseware 2:

"Subtract a few from 14 and 15" Subtraction within 20 PPT courseware 2. Calculate 7+7= 12-7= 5+9= 13-8= 9+6= 12-4= 7+8= 13-6= 9+( )=14 ( )+7=14 8+( )=15 ( )+6=15 How many methods can you use to calculate? 12-8=4 Gradually reduce: 12-2-6=4..

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Update Time: 2024-09-07

This template belongs to Mathematics courseware Western Normal University Edition First Grade Mathematics Volume 1 industry PPT template

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