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"Two digits minus one digit, whole ten numbers" Addition and subtraction within 100 PPT download
Part One: Introduction to the topic
1. Calculate each of the following questions.
48-6= 59-9= 87-5=
18-9= 16-8 = 12-6=
2. See the diagram for the calculations.
( )-( ) = ( ) (root)
Two-digit minus one-digit integer PPT, part 2: new teaching knowledge
1. Look at the picture below. There are 36 footballs in total. 8 have been borrowed. How many are left?
Our class borrows 8
36-8=28
2. How did the students calculate the above equation?
36 - 8 = 36 - 8 =
First calculate 16-8=8, first calculate 10-8=2,
Then calculate 20+8=28, then calculate 26+2=28
3. Think about it and fill it in.
When calculating 63-5, think: 63 can be divided into ( ) and ( ), first calculate ( )-( )=( ), then calculate ( )+( )=( ). You can also think like this: 63 can be divided into ( ) and ( ), first calculate ( )-( )=( ), then calculate ( )+( )=( ).
To subtract a one-digit number from a two-digit number, start subtracting from the ones digit first. If the number in the ones digit is not enough to subtract, take a ten from the tens digit, combine it with the ones digit, and then subtract. At the same time, the ten The number of digits must be reduced by 1.
Two-digit minus one-digit integer PPT, the third part: knowledge sorting
Knowledge point 1: Calculation method of two digits minus one digit (abdication).
Example 1: The new semester has begun. His mother gave Xiao Ming 25 yuan to buy stationery. Xiao Ming spent 9 yuan. How many yuan does he have left?
25-9=16
[Analysis] To find out "How many yuan are left?" use subtraction to calculate, and the column formula is 25-9. When calculating the subtraction of a two-digit number minus a one-digit number such as 25-9, the following calculation method can be used:
[Method Summary] To subtract a one-digit number from a two-digit number, you can start subtracting from the ones digit first. If the ones digit is not enough to subtract, then subtract 1 from the tens digit as a ten, and then add the number in the ones digit to subtract one digit. At the same time, the number in the tens place must be subtracted by 1. You can also divide the two-digit number into 10 and tens. First subtract one digit from 10, and then add the result to the tens.
Two-digit minus one-digit integer PPT, Part 4: Classroom exercises
1. Think and calculate.
Calculate first ( ) - ( ) = ( )
Then calculate ( ) + ( ) = ( )
2. Pick watermelons.
25-16= 26-8= 23-7=
32-6= 96-9=
3. Small animals cross the river.
Two-digit minus one-digit integer PPT, Part 5: Homework
1. Little bees collect honey.
2. Fill in “+” or “-” in ○.
73 ○0=73 89○9=80 56○6=62
93○7=86 38○20=58 64○5=59
52○4=48 79○8=87
3. At the beginning of the school year, Xiao Ming bought 31 exercise books, and now there are still 9 exercise books left. How many copies did Xiao Ming use?
31-9=22
4. Think about it and fill it in.
(1) Subtract 8 continuously from 60 and write the difference each time.
60. ( ), ( ), ( ), ( ), ( ).
(2) Subtract 5 continuously from 72 and write the difference each time.
72. ( ) , ( ), ( ), ( ), ( ).
Two-digit minus one-digit integer PPT, part six: divergent thinking
1.Hide and seek. (The sum of the three numbers on each straight line is 45. Find the number covered by letters in the circle)
A=20; B=15; C=21; D=16; E=25
[Analysis] First observe which straight line the three numbers are on. We know two. Because we know two, we can find the third number based on the sum of the three numbers on each straight line being 45.
Keywords: Free download of PPT courseware for mathematics in the second volume of the first grade of the People's Education Press, download of two-digit subtraction of one-digit integers PPT, download of addition and subtraction within 100 PPT, .PPT format;
For more information about the PPT courseware "Addition and subtraction of two-digit numbers within 100, subtracting one-digit integers from tens", please click the PPT tag of Addition and subtraction of two-digit numbers within 100, subtracting one-digit integers from tens.
"Two digits minus one digit, whole tens" Addition and subtraction within 100 PPT courseware download:
"Two digits minus one digit and whole tens" Addition and subtraction within 100 PPT courseware download Part 1 content: Learning objectives 1. Understand and master the calculation of two digits minus one digit (without abdication) and whole tens method. 2. Be able to correctly calculate and solve practical problems according to calculation methods..
"Two digits minus one digit, whole tens" PPT teaching courseware for addition and subtraction within 100:
"Two digits minus one digit, whole tens" PPT teaching courseware for addition and subtraction within 100 Part One Content: Review knowledge 35+4= 42+3= 5+21= 35+40= 42+30= 50+21= All numbers with the same digit are directly related add. These two sets of questions...
"Two digits minus one digit, whole ten numbers" Addition and subtraction within 100 PPT:
"Two digits minus one digit, integer tens" PPT on addition and subtraction within 100 Part 1: Conversation introduction Students recall that when we were learning to add one digit to integer tens and integer tens (without carrying) , how did you find the solution to the problem? This section...