1. Lesson 9 and 10

2.  Use math drawings to represent the composition when adding a two-digit to a three-digit addend.

3.  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?

4.  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?  372 20 less? 100 more?100 less? 102 less?220 less? 510 more?

5.  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

6. Sprint A On your mark, get set, THINK Sprint B On your mark, get set, THINK

7.  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’s1’s 3 4 + 1 8

8.  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’s1’s 3 4 + 1 8

9.  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’s10’s1’s 1 3 4 + 1 8

10.  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.

11.  Moses sold 24 raffle tickets on Monday and 4 fewer on Tuesday. How many tickets did he sell in all on both days?

12.  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 + 147 100’s10’s1’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.

13.  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’s10’s1’s 1 4 7 + 2 6 3 1 37 7 1 1

14.  Solve these problems:  35 + 106  81 + 109  117 + 48  23 + 159