14. Mastery Objective 14: Explanation of why multiplying versus dividing is appropriate for unit conversions, using pictures. Your student, Ahn-Thu, often divides when she should multiply and multiplies when she should divide when she's converting units. Approach the following prompts with Ahn-Thu in mind. Draw clear pictures and explain why you choose to multiply or divide. There are 3 feet in 1 yard. (a) The trailer on a semi-truck is 50 feet long. How long is it in yards? ovign (b) A water tower is 50 yards high. How high is it in feet? laginni O moldu anbboi lo Joileqaa a nalnt o) biq a wand (d) wod alaleo l oapa emos sbni bao mos (c) Why do students often make the mistake that Ahn-Thu tends to make, swapping the multiplication and division operations, when approaching questions like these?

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