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Authoritative PPT Summary
"Simple Addition and Subtraction Calculations" PPT
Part One: Knowledge Review
fill in the blank.
80 cents and 6 cents = ( ) yuan
2.5 yuan = 2( )5( )
0.49 yuan = 4( )9( )
Example 1 Buying toiletries.
(1) How much does it cost to buy a toothbrush and toothpaste?
4.2+6.5=10.7 (yuan)
First add the dollars and angles separately...
4 yuan + 6 yuan = 10 yuan
2 cents + 5 cents = 7 cents
10 yuan + 7 cents = 10 yuan and 7 cents
10 yuan and 7 jiao = 10.7 yuan
Can be calculated vertically.
Simple addition and subtraction calculation PPT, part 2: practice.
(1) How much does it cost to buy a towel and a piece of soap?
8.4+3.4=11.8 (yuan)
(2) How much more does a bottle of shampoo cost than a towel?
12.5-8.4=4.1 (yuan)
(3) Ask and solve mathematical problems yourself.
Simple addition and subtraction calculation PPT, the third part: summary:
To calculate the addition and subtraction of decimals, first align the decimal points of each number (that is, align the decimals on the same digit), then perform the calculation according to the rules of addition and subtraction of integers, and finally align the decimal points on the horizontal line in the resulting number, and dot decimal point.
Note: Count from low position.
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For more information about the PPT courseware "Preliminary Understanding of Decimals and Simple Addition and Subtraction Calculation", please click on the "Preliminary Understanding of Decimals ppt Simple Addition and Subtraction Calculation" ppt tag.