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Borrowing Bonaza!
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Do Now
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Borrowing
Big Ideas Review
What do we already know about Borrowing?
A ten can be decomposed into ten ones.
Big Idea #1
15 ones = 1 ten + 5 ones
10 + 5
When exchanging between place values, the units may change, but the overall value stays the same.
Big Idea #2
US Subtraction Algorithm
Let's subtract:
651- 170
Place Value Chart
Example # 1
Example #2
Let's subtract:
651- 172.
US Subtraction Algorithm
Place Value Chart
Checkpoint !
What do I do if I have fewer tens in the top number than in the bottom number?
Borrow ten tens by decomposing 1 hundred into ten tens
How do I show that I have decomposed a hundred?
CFU
Cross out the number of hundreds and reduce it by one ten and rewrite the new number of hundreds
How do I show the ten tens in the tens place?
Cross out the number of tens and add that number to 10 and rewrite the new number of tens
Try these examples!
Guided Practice
1. 542 - 368 =
2. 815 - 579 =
3. 424 - 285 =
4. 613 - 485 =
Time to check your answers!
2. 815 - 579 = 236
Check, Check !
Great Work Mathematician!
1. 542 – 368 = 174
3. 424 - 285 = 139
4. 613 - 485 = 128
Use your Tools!
US Subtraction Algorithm Resource
Your turn!
You will have 15 minutes to practice subtracting numbers using the US algorithm. Then, move on to your story problem.
Let’s see who is going to crush it! You got it!
Independent Practice
Your turn!
Exit Ticket
Over the course of the day we learned a lot! We learned how to borrow within two places when subtracting numbers! Now you get to show what you know on your exit ticket!
Topic
Continue to love math!