Topics
6. Multiplication and division
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United States of AmericaUT
Grade 3

6.10 Story problems with mixed operations

Lesson
Practice
Lesson

Are you ready?

Let's try this problem to practice reading a story problem and then writing the number sentence that we would use to solve it. 

Gwen has $30$30 chocolates to give out to $10$10 guests at his birthday party and wants to make sure each guest gets the same amount.

  1. Write a number sentence for this story problem to find how much each guest would get.

Learn

Sometimes we need more than one step to solve a number problem, so it helps to look at how to work through each step.

Apply

question 1

Jack has $25$25cm of ribbon, which he cuts into $5$5 equal pieces.

He then selects one of these pieces, and cuts $1$1cm off it.

  1. How long is this piece of ribbon now?

Remember!
  • Mathematical problems can be represented with words, pictures and symbols.
  • If our problem has equal groups and we need to find a total, we use multiplication.
  • If we have to share our total into equal groups, we use division.

Outcomes

3.OA.8

Solve two-step word problems.

3.OA.8.a

Solve two-step word problems using the four operations. Know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations). (Limit to problems posed with whole numbers and having whole number answers.)

3.OA.8.b

Represent two-step problems using equations with a letter standing for the unknown quantity. Create accurate equations to match word problems.

3.OA.8.c

Assess the reasonableness of answers using mental computation and estimation strategies, including rounding.

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