Question posted by Jino Tolentino from the Philippines:

Grade/Level: Grade 4

Question solved by Model Method: Betty collected 3600 stickers more than Carol. She collected 9 times as many stickers as Carol. Dianne had 145 more stickers than Carol. How many stickers did Dianne have?

Answer:

Step 1: This question involves the
Repeated Variable Concept the
Comparison Concept . Since Betty collected 9 times as many stickers as Carol, we draw 9 boxes to represent Betty and 1 box to represent Carol.

Step 2: And as Betty collected 3600 stickers more than Carol, the extra 8 boxes(8 units) she had must be equivalent to 3600.

Step 3: It was also given that Dianne had 145 more stickers than Carol. So we draw 1 box and another "145" more to show the number of stickers Dianne had.

Thus,

8 units ---------- 3600 stickers

1 unit ---------- 3600 stickers / 8 = 450 stickers

450 stickers + 145 stickers = 595 stickers

Therefore, Dianne had 595 stickers