Western Normal University Edition Second Grade Mathematics Volume 2

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"Addition of three-digit numbers" Addition and subtraction of three-digit numbers PPT courseware

Approximately how many pens are there?

220 + 260≈500 (piece)

Answer: There are about 500 pieces of both pens in total.

First estimate how many people there are

433 + 418≈800 (person)

Answer: Fengshou Primary School has about 800 students.

If the same digits are aligned, if the ones digit reaches ten, add one to the tens place. When calculating the tens place, add the 1 that comes up from the ones digit.

【teaching objectives】

1. Let students master the calculation methods of adding three-digit numbers to three-digit numbers without carry and with discontinuous carry.

2. Make estimates based on life situations and cultivate students’ estimation awareness.

3. Cultivate students' awareness of choosing appropriate methods to solve practical problems according to specific situations, and experience the diversity of computing methods and problem-solving strategies.

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For more information about the PPT courseware "Addition and subtraction of three-digit numbers and addition of three-digit numbers", please click the Addition and subtraction of three-digit numbers ppt Addition of three-digit numbers ppt tag.

"Addition of three-digit numbers" Addition and subtraction of three-digit numbers PPT courseware 3:

"Addition of three-digit numbers" Addition and subtraction of three-digit numbers PPT courseware 3 200+200=40020+60=80 400+80=480 200+260=460 460+20=480 220+200=420 420+60= 480 Add 2 hundreds to 2 hundreds to get 4 hundreds. Add 2 tens to 6 tens to get 8 tens. The total is 48..

"Addition of three-digit numbers" Addition and subtraction of three-digit numbers PPT courseware 2:

"Three-digit addition" Three-digit addition and subtraction PPT courseware 2 Review introduces 8+6+1= 6+4+1= 7+5+1= 9+3+1= Summary: We are calculating consecutive carries When adding, if the number in which digit adds up to ten, one must be added to the previous digit. ... ... ....

"Abdication Subtraction" PPT courseware for addition and subtraction of two or three digits:

"Abdication and Subtraction" PPT courseware for addition and subtraction of two and three digits. Calculation verification method: Add and subtract numbers using differences (the answer is equal to the minuend, then the calculation is correct, otherwise it is wrong). How many more children's novels are there than folktales? 335-185=150 (books) Which one is not enough to reduce...

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Update Time: 2024-12-10

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