"Two-Level Mixed Operations Without Parentheses" Four Mixed Operations PPT Courseware

Description

"Two-Level Mixed Operations Without Parentheses" Four Mixed Operations PPT Courseware

teaching objectives

1. Experience the process of independent problem solving and try to rewrite step-by-step calculations into comprehensive calculations.

2. Combined with specific examples, understand the operation sequence of two-level mixed operations, and be able to perform simple four-level mixed operations of integers.

3. Actively participate in mathematics activities, gain a successful learning experience, and feel the rationality of the order of operations.

How many bottles of drinks are there in total?

Observe the situation diagram and tell me what mathematical information you discovered?

①Calculate using continuous addition

24+24+24+12=84 (bottle)

Answer: There are 84 bottles of drinks in total.

② First count the number of bottles in the 3 boxes, and then add the 12 bottles outside the box.

24×3=72 (bottles)

72+12=84 (bottle)

Answer: There are 84 bottles of drinks in total.

If you buy a full case of wine, how much cheaper is it on average per bottle than the retail price?

480÷6＝80 (yuan)

86-80＝6 (yuan)

86-480÷6

＝86-80

=6 (yuan)

In conclusion

In a calculation, there are both multiplication and division as well as addition and subtraction. The multiplication and division must be calculated first.

practice

1. Let’s talk about the order of operations first, and then calculate.

24＋246÷6 40×5－162

240－24×6 220－175÷5

2. Electronic City sold 850 computers in the first half of the month, and the number of computers sold in the second half of the month was twice that of the first half of the month.

(1) How many computers were sold this month?

850＋850×2＝2550 (unit)

Answer: A total of 2,550 computers were sold this month.

(2) How many more computers were sold in the second half of the month than in the first half?

850×2 - 850＝850 (unit)

Answer: 850 more computers were sold in the second half of the month than in the first half.

3. The school bought 5 boxes of badminton, 12 in each box. 20 are used, how many are left?

12×5-20=40 (pieces)

Answer: There are 20 left.

Keywords: Four mixed operations teaching courseware, two-level mixed operations teaching courseware without brackets, Hebei Education Edition third-grade mathematics PPT courseware download, third-grade mathematics slide courseware download, four mixed operations PPT courseware download, without brackets Two-level mixed operation PPT courseware download, .PPT format;

For more information about the PPT courseware "Four Mixed Operations Two-Level Mixed Operations Without Brackets", please click the "Four Mixed Operations ppt Two-Level Mixed Operations Without Brackets ppt" tag.

File Info

Update Time: 2024-09-07

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

Preview