M2 L19 Powerpoint

1. Place Value and Problem Solving with Units
of Measure
Topic E: Two- and Three-Digit Measurement
Subtraction Using the Standard Algorithm
Module 2: Lesson 19
Objective: Decompose twice to subtract
measurements including three-digit minuends
with zeros in the tens and ones places.

2. Fluency Practice
(12 minutes)
Subtract mentally (4 Minutes)
Say the number sentence in units of one.
10 – 5 = ____ Yes! 10 ones – 5 ones = 5 ones.
12 – 5 = ____
42 – 5 = ____

3. Fluency Practice
(12 minutes)
Subtract mentally (4 Minutes)
Now say the number sentence in the units of ten.
100 – 50 = ____ Yes! 10 tens – 5 tens = 5 tens
120 – 50 = ____
420 – 50 = ____

4. Fluency Practice
(12 minutes)
Use Subtraction Algorithm with Various Units
(4 minutes)
Write 80 L – 26 L = ____ on your boards and
solve it using the standard algorithm.
Continue with the following possible sequence:
380 L – 26 L and 380 L – 126 L;
908 g – 25 g and 908 g – 425 g;
419 cm – 32 cm and 419 cm – 232 cm.

5. Fluency Practice
(12 minutes)
Round Three- and Four-Digit Numbers (4 min.)
253 ≈ _____. What is 253 rounded to the
nearest hundred?
(Draw a vertical number line to help you,
marking and labeling the endpoints and the
halfway point, and plotting 253 on the line.)
Now try rounding the following to the nearest hundred:
1253, 735, 1735, 850, 1850, 952, 1371, and 1450.

6. Application Problem
(5 minutes)
Read – Draw - Write
Jolene brings an apple and an orange with her
to school. The weight of both pieces of fruit
together is 417 grams. The apple weighs 223
grams. What is the weight of Jolene’s orange?
Model this problem with a tape diagram and
solve.

7. Application Problem
(5 minutes)

8. Concept Development (33 minutes)
Part 1: Decompose twice using the standard algorithm for subtraction.
In the Application Problem, Jolene’s apple weighs 223 grams
and her orange weighs 194 grams.
What does the question mark in these tape diagrams
represent?
Tell a partner what equation you
can use to find out how much
heavier the apple is than the orange.
Write the equation vertically
on your board.

9. Concept Development (33 minutes)
Part 1: Decompose twice using the standard algorithm for subtraction.
Before we subtract, what needs to be done?
That’s right! We need to see if any tens or hundreds
need to be unbundled.
Do we have enough ones to subtract?
How about in the tens place?
Unbundle or change the ten. How many tens and ones do
we have now?
Now unbundle or change the hundred. How many
hundreds and tens do we have now?
Are we ready to subtract? OK! Solve the problem!

10. Concept Development (33 minutes)
Part 1: Decompose twice using the standard algorithm for subtraction.
How much heavier is the apple than the orange?
The apple is ____ grams heavier than the orange!
Now try these problems! Remember to
get ready to subtract by unbundling all
necessary digits first. 342 cm – 55 cm;
b 764 g – 485 g; 573 mL – 375 mL
How are the subtraction problems we’ve solved so far
different than those we solved yesterday?
That’s right! Today we had to unbundle twice!

11. Concept Development (33 minutes)
Part 2: Use the standard algorithm to subtract three-digit numbers
with zeros in various positions.
Kerrin has 703 milliliters of water in a pitcher. She
pours some water out. Now, 124 milliliters are left in
the pitcher. How much water did Kerrin pour out?
Solve this problem using the subtraction algorithm.
703 mL What needs to be done first?
-124 mL That’s right, we need to unbundle a ten.
What digit is in the tens place on top?
Can we unbundle 0 tens? Where can we get tens?

12. Concept Development (33 minutes)
Part 2: Use the standard algorithm to subtract three-digit numbers
with zeros in various positions.
That’s right! We can change 1 hundred into 10 tens!
Change the hundred into tens on your board. How many
hundreds and tens does the top number have now?
Why aren’t we ready to subtract yet? That’s right! We
still have to change 1 ten for 10 ones.
Finish unbundling on your board and complete the
subtraction.

13. How many milliliters of water did Kerrin pour out?
She poured out _____ milliliters of water!
Now try these problems! Remember to get ready to
subtract by unbundling all necessary digits first.
 703 cm – 37 cm
 700 mL – 356 mL
 500 g – 467 g
Concept Development (33 minutes)
Part 2: Use the standard algorithm to subtract three-digit numbers
with zeros in various positions.

14. Problem Set (10 minutes)
You have 10 minutes to complete the problem set pages.
Do your personal best, remember to use RDW, and
show your work!
Debrief (10 minutes)
Let’s review your solutions for the Problem Set.

15. Exit Ticket
(3 minutes)
This is where you are going to show
that you understand what we learned today!
Are you ready for the next lesson?!

16. Homework
3-2 Lesson 19
Homework
Is Due Tomorrow!