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Authoritative PPT Summary
"Mixed Addition and Subtraction" Addition and subtraction within 100 PPT courseware 2
review:
1. Column vertical calculation.
36+28+17= 65-25-21=
2. Answer orally.
(1) There were originally 10 birds on the tree, 5 flew away, and 3 more flew back. How many birds are there now?
(2) Xiao Ming has 4 pencils. He bought 6 more and used 5. How many pencils does he have now?
learning target:
1. Master the order and method of mixed operations of addition and subtraction of numbers within 100.
2. Be able to correctly use vertical expressions to calculate addition and subtraction mixed operation questions.
Give it a try:
56+34-20= 78-24+39=
96-60+24= 50+27-23=
Let’s talk about it: What should you pay attention to when doing addition and subtraction in writing?
1. The same digits must be aligned;
2. Count from the ones position;
3. When the ones digit adds up to ten, advance 1 to the tens digit;
4. If the ones digit is not reduced enough, then move back 1 from the tens digit.
I am a little calculation expert:
52+29-38= 65-28+17=
36-24+58= 45+14-27=
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