Math – Day 4 Problem-Solving Steps Choosing the Operation: Addition and Subtraction

What strategies can I use to solve word problems?

Read and Understand ? What am I trying to find out? ? What do I know? Plan and Solve ? What strategy or strategies should I try? ? What is the answer? Look Back and Check ? Did I answer the question? ? Does my answer make sense?

Jacob had 50 Lego blocks. For his birthday, he got a set of 70 Lego blocks. How many Lego blocks does Jacob have now? 50 Draw a Picture and Write an Equation Read and Understand Plan and Solve Look Back and Check b = 120 Lego blocks b + =b

Jacob was looking for all of the blue Christmas tree lights. There were 100 total lights on the strand, and 20 of them were blue. How many lights were not blue? Read and Understand Plan and Solve Look Back and Check Draw a Picture and Write an Equation 100 t = 80 lights =t t

Addition

combining unequal groups to find the total = 10 addends sum

combining unequal groups to find the total altogether 53 m = m m = 8 miles

altogether Ruby makes $520 a week, and her daughter Marie makes $350 a week. What is their combined weekly income? combined Farmer Brown picked 12 apples from the tree in his front yard and 24 apples from the tree in his back yard. How many apples did Farmer Brown pick in all? in all Mrs. Gibson placed 8 roses, 12 carnations, and 2 daisies in a vase. How many total flowers did she put in the vase? total Jack collected $35 for the PTA fundraiser. Liz collected $15 more than Jack. How much money did Liz collect? more than Julie earned $20 babysitting on Friday night, $40 babysitting on Saturday night, and $10 babysitting on Sunday afternoon. What was the sum of her earnings? sum

Addition Subtraction

separating the total into unequal groups = 3 difference

2 how many more separating the total into unequal groups Addition m 24 – 10 = m m = 14 miles

The temperature at noon was 85°F. By 6:00 p.m., it had decreased by 15°F. What was the temperature at 6:00 p.m.? how many more Abby had $950 in her checking account. She wrote a check for $539. How much money does she have left in her account? left Two years ago 532,119 citizens of Brown County voted. Last year 488,795 voted. What was the difference in the number of people voting? difference Mrs. Jones baked 72 cookies on Saturday. Her neighbor Mrs. Smith baked 20 fewer cookies than she did. How many cookies did Mrs. Smith bake? fewer On Thursday, 125 fourth graders ordered hot meal for lunch. On Friday, 37 less fourth graders ordered hot meal for lunch than on Thursday. How many fourth graders ordered hot meal for lunch on Friday? less decreased

Let’s Practice!

1.In one week, Sandy earned $36 from her babysitting job. She got $15 more for doing her chores. How much money did Sandy earn that week? __________________ m = m $51

2.A shoe store sold 162 pairs of shoes. The goal was to sell 345 pairs. How many more pairs of shoes did they need to sell to meet their goal? ______________________ p = p 183 pairs of shoes

3. Jacob has 145 books in his home library. Andrew has 127 books. How many books do they have combined? ______________________ b = b 272 books

Your Turn!