"Mixed Operations of Addition and Subtraction" PPT courseware

Description

"Mixed Operations of Addition and Subtraction" PPT courseware

teaching objectives

1. Combined with specific situations, experience the process of independently exploring calculation methods of mixed calculations of addition and subtraction.

2. Master the order of mixed operations of addition and subtraction, and be able to correctly calculate mixed operations of addition and subtraction within 100.

3. In the process of solving simple problems, realize the close connection between mathematics and life.

I calculate it like this:

18+23=41 (pieces)

41-22=19 (pieces)

18+23-22

=41－22

=19 (pieces)

Answer: There are 19 balls left.

Mixed operations of addition and subtraction must be calculated from left to right.

give it a try

1. Do the math.

38+47-65 85-46+22

53-40+27 62+34-82

2. Fill in the blanks.

10+45-25= ( )

33-15+25= ( )

50＋26＋11＝ ( )

66-24+25= ( )

81＋19－81＝ ( )

24-19+30= ( )

practice

1. There are 38 passengers on the bus. How many passengers are there now?

Nine passengers got off the bus and 12 got on.

2. How many pine cones are there now?

3. The school has 65 boxes of white chalk and 27 boxes of colored chalk. 73 boxes have been used. How many boxes are left?

4. There were originally 53 cars in the parking lot. 26 cars left and 19 more cars came in. How many cars are there now?

5. There are 75 books in the small book corner of Class 2 (1). 40 books were borrowed on Friday and 26 books were returned. How many books are there in the library corner now?

6. Do the math.

73-39+46 43+27-50

42+50-66 96-80+35

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File Info

Update Time: 2024-09-04

This template belongs to Mathematics courseware Hebei Education Edition Second Grade Mathematics Volume 1 industry PPT template

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