lesson 9 and 10. use math drawings to represent the composition when adding a two-digit to a...
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Marla spilled a box of paper clips. They landed on her desk and onto the floor. 20 of them landed on her desk, and 5 more fell on the floor than landed on her desk. How many paper clips did she spill?TRANSCRIPT
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Module 4Lesson 9 and 10
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Objective Use math drawings to represent the composition when adding a two-digit to a three-digit addend.
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Application Problem Marla spilled a box of paper clips.
They landed on her desk and onto the floor. 20 of them landed on her desk, and 5 more fell on the floor than landed on her desk. How many paper clips did she spill?
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Fluency Practice Say the number in standard form.
Ready? 352 Say the number in expanded form.
Ready? 300 + 50 + 2 Say the number Say Ten way 3 hundreds, 5 tens, 2 ones What is 20 more than 352? 37220 less?
100 more?
100 less?102 less? 220 less? 510 more?
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Fluency Practice Let’s use a mental math strategy to subtract.
52 – 39 = ____ How much more does 39 need to make the
next ten? 1 more. Add 1 to each number and give me the new
number sentence. 53 – 40 = solve 53 – 40 =13 37-19 38 - 20 = 18
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Sprints• Sprint A• On your mark, get set, THINK
• Sprint B• On your mark, get set, THINK
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Concept Development Write 34 + 18 the vertical way on your
paper. Now draw a model using a place value
chart like this one. Label the tens and ones.
Now draw a model of each addend. Start with the top number.
Now the bottom addend Check your model 10’s 1’s
3 4+ 1 8
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Concept Development What is 4 ones + 8 ones? 12 ones! Did you notice anything
about your ones? Bundle! Circle ten ones as one 10 Write a 1 on the line below the tens
place, and write 2 under the line below the ones place.
Now we add the tens. So 34 + 18 equals 52. 10’s 1’s
3 4+ 1 8
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Concept Development Write 134 + 18 the vertical way on your paper What is 4 ones + 8 ones? 12 ones! Did you notice anything about your
ones? Bundle! Circle ten ones as one 10 Write a 1 on the line below the tens place, and
write 2 under the line below the ones place. Now we add the tens. Now add the hundreds So 134 + 18 equals 152.
100’s
10’s 1’s
1 3 4 + 1 8
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Concept Development Now you practice. 114 + 37 158 + 26 163+ 29 48 + 147 While you practice I will walk around
to see how you are using the strategies that we are working on.
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Application Problem Moses sold 24 raffle tickets on
Monday and 4 fewer on Tuesday. How many tickets did he sell in all on both days?
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Concept Development Copy the following problem on your
paper in vertical form. Use place value language to prove to your partner that you have lined the numbers up correctly.
26 + 147100’s 10’s 1’s
When you’re finished, check your work with a partner, and explain how your model matches the written addition. Use place value language to explain each step used.
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Check Your Work 26 + 147 can be written with any
number on the top but, it is easier and less confusing to write the bigger number on the top.
100’s 10’s 1’s 1 4 7+ 2 6
3
1
37
7
1
1
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Your Turn! Solve these problems: 35 + 106 81 + 109 117 + 48 23 + 159