3 results for "addition"

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Place Value: Addition Within 1,000

3rd Grade

Objective

Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Multistep Word Problems

3rd Grade

Objectives CCSS Math: Operations & Algebraic Thinking 3.OA.D.8: Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. 4.OA.A.3: Solve multistep word problems posed with whole numbers and having whole-number answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding. Materials Needed Cardboard box or posterboard, cut into an outline of a bus (optional) Whiteboard or chart paper Tim’s Yard Work flyer Neighborhood Jobs reproducible Neighborhood Jobs Answer Key Preparation Print out a copy of the Tim’s Yard Work flyer and the Neighborhood Jobs reproducible for each student in your class. (You can also display the flyer on a document camera.) Introduction Instruct students to listen very carefully to the following story problem: Mr. Smith is driving a bus. At first, the bus has no passengers. At the first stop, 10 passengers get onto the bus. At the second stop, 2 passengers get off the bus. Then 4 passengers board the bus. At the third stop, half the passengers get off the bus. Pause for a few seconds. Then ask, “Now...what is the name of the bus driver?” Most students will likely react with surprise at this question, but a few will remember that you stated who was driving the bus at the beginning of the story problem. Affirm that the name of the bus driver is Mr. Smith. Ask students to raise their hands if they were calculating the number of passengers getting on and off the bus. Explain that, although this story problem was a riddle with a surprising twist at the end, those with their hands raised were actually calculating a multistep math problem that involved addition, subtraction and even division. Point out that this exercise is also a good example of why it is helpful to read the whole problem first in order to find out what information is needed to answer the question.

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Elapsed Time

3rd Grade - 4th Grade

Objectives CCSS Math: Measurement & Data 3.MD.A.1: Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram. 4.MD.A.2: Use the four operations to solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money, including problems involving simple fractions or decimals, and problems that require expressing measurements given in a larger unit in terms of a smaller unit. Represent measurement quantities using diagrams such as number line diagrams that feature a measurement scale. Materials Needed Lakeshore Magnetic Teaching Clock Lakeshore Student Clocks - Set of 12 “Elapsed Time Word Problems” activity page Elapsed time worksheet Introduction Ask a student what time school starts. Write this time on the board under the heading “Start Time.” Then ask another student what time school ends. Write this time next to the start time under the heading “End Time.” Ask, “From the time school starts to the time it ends, how much time elapses, or passes?” (Invite students to respond and explain their reasoning and calculations.) Hold up the teaching clock and demonstrate how to set the clock at the start time and count the hours and minutes until the end time. (Hint: Move the hour hand first and have students count the hours aloud with you. Then move the minute hand and have them count the minutes.) Explain to students that you are going to teach them some strategies to help them calculate elapsed time.

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3 results for "addition"