<p> Grade 3 Unit 2 – Adding and Subtracting Whole Numbers Extension Menu – Teacher’s Notes</p><p>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</p><p>2. Problem Solving – Money, Money, Everywhere - see attached worksheet</p><p>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. </p><p>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</p><p>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.</p><p>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 </p><p>7. Math and Literature. Students determine letter frequency in their favorite books or current independent reading books. See TE page 127, Letter Frequencies</p><p>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. </p><p>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). </p>