Use the “Adding Up” Strategy NUMBER TALK 100 – 74 Use the “Adding Up” Strategy

Investigate and Interpret Remainders Lesson 2

Let’s Solve and Discuss… You have 5 cookies that you want to share with 2 friends.  How many cookies do you give each friend?  First, draw 2 groups… What are you going to do with that leftover cookie? EAT IT!! …or cut it in half to share!  Then, make 5 counters… 5 ÷ 2 cannot be shared equally into groups, we will have cookies left over. Start by sharing the cookies one at a time into each group. Now, I have one cookie leftover So 5 ÷ 2 = 2 with 1 left over, or remaining. So 2 remainder 1 (2 R 1)

Today… We are going to learn the strategy equal groups, and decide what to do with the left overs.

Let’s Try… I want to share 63 star bucks equally with 5 students. What is the greatest amount of star bucks can each student get? 63 ÷ 5 = _____ 12 R 3 I can “Think Multiplication” by saying 5 x 12 = 60, with 3 leftover. So, each student can get 12 star bucks each. WHAT IF ** the problem said: I want to share 63 starbucks equally with 5 students. How many starbucks do I have left? 3 

Let’s Practice… I have 80 candy-sticks that I want to share equally with 7 friends. How many candy-sticks will be leftover? Write the equation.  80 ÷ 7 = ______ 11 R 3 Think Multiplication. I know 7 x 10 gets me 70, but I need 80, so I am going to keep multiplying. 7 x 11 = 77, only 3 more numbers to 80. 7 x 11 is the closest I can get to 80 without going over. 80 – 77 = 3 So, each person gets 11 candy sticks and there will be 3 leftover.

Determine the missing amount… There are 28 students going on a field trip to the Kravis Center.  Each car only holds 5 students.  How many more students can go on the field trip to only have full cars? First, write my equation: 28 ÷ 5 = ____ 5 r 3 (3 students leftover) Then, think multiplication to solve: 28 ÷ 5 = ____ 5 x 5 = 25, 3 left over 5 r 3 How many more students do we need to fill another car? Well, each car fits 5 students. 5 - 3 = 2 more students to fill the car.

There will be some left over. Solve with a Partner Mrs. Brown-Haynes has 117 Ringpops to share with the 5 fourth grade classes. She wants to know if there are enough Ringpops for each student to have one if there are 20 students in the class. 117 ÷ 5 = ______ Ringpops for each class 23 r 2 23 x 5 = 115 117-115 = 2 Yes, she will have enough Ringpops for each student to have at least 1. There will be some left over.