Unit 2 Addition, Subtraction, and Multiplication
Transcript of Unit 2 Addition, Subtraction, and Multiplication
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Math 5: Whole Numbers
Subtracting with 4-digit numbers and Multiplication and Division facts to 144
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Addition
DVD Player - $149
3D Television - $379
Ipod - $219
What are some different ways we could add the number?
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Addition – Show me
Base Ten Blocks
Add two numbers then another
How can you tell if your answer is reasonable? (Estimate)
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Add using place values
DVD Player - $149
3D Television - $379
Ipod - $219
Add the ones: 149 And regroup in the tens
379
+219
Then add the tens and regroup in the hundreds
Then add the hundreds.
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Subtraction Maha’s had 10 800 seconds to complete a run. She ran for 9586
seconds. How much longer does Maha have?
10 800 – 9586
Use Place Value to Subtract.
10 800
- 9 586
……….
You cannot take 6 from 0 ones. There are no tens to regroup. Regroup 8 as 7 hundreds 10 tens.
Regroup 10 as tess as 9 tens 10 tens.
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Subtraction
Subtract the ones
Subtract the tens
Subtract the hundreds
To subtract the thousands, regroup 1 ten thousand as 10 thousands.
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Check
To check if you answer is correct:
Total
+ Second Number
= The top number
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Multiplication
197 x 68. How do we set this up?
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Multiplication
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Multiplication
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Multiplication
Add ZERO!!! Because you are now actually multiplying by 60!
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Multiplication
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Multiplication
All done! Just add the numbers together to get your answer
13396
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In Class work
. 62 #1, 2 abc, 7, 10 and pg. 66 #1, 3, 5.
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Homework
pg. 26-28