Exam 3: Understanding Whole Number Operations

Which calculation and type of division does this drawing illustrate?

Felisha was asked to find 413 - 248. Here is how she did this problem: 413 -5 -30 165 Is her answer correct? Explain what she was doing. Find 9456 - 3789 using this method.

Zenaida is asked to add 428 and 686 in vertical form. She begins by saying, "Six thousand plus four thousand..." The interviewer then asks her what column the six and four are in, and she identifies it as the hundreds column. She begins again by saying, "Four hundred plus six hundred is ten hundred," and writes 110 below the line. She then says we have to do tens. She does 20 plus 80 equals 100 and places that under the 110. She then adds 8 and 6 and writes 14 and then writes that below the 100. Adding, she says it is 224. Where does Zenaida go wrong? Discuss her place value understanding.

The large rectangle is divided into two smaller rectangles. Write a number sentence involving multiplication that shows that the area of the large rectangle is equal to the sum of the areas of the two smaller rectangles.

In a board game, a murder occurs. There are six possible suspects (Plum, White, Green, Mustard, Peacock, Scarlet), six possible weapons (candlestick, knife, lead pipe, revolver, rope, wrench), and nine possible rooms where the murder can take place. At the beginning of the game, three cards are chosen at random (one suspect, one weapon, one room). A) How many different ways can these three cards be chosen? B) If the game maker decided to add another possible suspect, Orange, to cover all the colors in the rainbow, how many more possibilities are there?

A) Can the following word problem be solved by 16 × 1/2? B) Does the word problem illustrate a situation involving 16 halves or half of 16? Word problem: Don has sixteen one-half dollars. How much money does Don have?