Unit 2 Adding and Subtracting Whole Numbers

Grade 3 Unit 2 – Adding and Subtracting Whole Numbers Extension Menu – Teacher’s Notes

1. Math and Science – Time Will Tell – Students divide a clock face and add the sum of the numbers. Answer to #3: A straight line that begins on the left side of the clock face between 9 and 10 and cuts across the clock face to the right side between 3 and 4. The sum of the numbers above the line equals 39, and the sum of the numbers below the line equals 39

2. Problem Solving – Money, Money, Everywhere - see attached worksheet

3. Writing about Math -Writing Number Stories - TE p. 114; TE 120 - Use Math Master p. 23 for recording. After finishing p. 37, students write their own problems with only the whole and one part. Refer to SRB pg. 237 for data.

4. Math Game – Runaway Math Puzzles – Three packets and answer sheets included. Cross-number puzzles form edHelper.com http://www.edhelper.com/runaway_math_puzzle_grade4.htm

5. Data Project - TE 127- Comparing Data- See attached worksheet. Students use the data on page 262 in their SRB to write comparison statements and prove that their statements are true.

6. Building Project- Measuring Pennies – See attached worksheet. The MegaPenny Project provides a concrete example what a billion or a trillion really is. Students build this understanding through an investigation of a common item- the US penny. Students will need a supply of pennies and a ruler. Check out the MegaPenny Project for data about stacks and stacks of pennies. http://www.kokogiak.com/megapenny/default.asp

7. Math and Literature. Students determine letter frequency in their favorite books or current independent reading books. See TE page 127, Letter Frequencies

8. Logic Problem - Math Mind Benders - See attached worksheet and Answers and explanation (A &E). Taken from: Hardnadek, Anita (1996). Math Mind Benders. Pacific Grove, CA: Critical Thinking Books and Software. Cross-number puzzles with non-routine clues. Students need to use clear thinking and deductive reasoning to solve the puzzles.

9. Math and Social Studies - TE 133 & 139 Making up Addition and Subtraction Problems based on a Mileage Map (SRB p. 248-249). Activity could be extended by having students determine the mileage from an actual trip (past or future).