3.3: Subtracting Decimals of Different Lengths
To represent 0.4-0.03, Diego and Noah drew different diagrams. Each rectangle represented 0.1. Each
square represented 0.01.
Diego started by drawing 4 rectangles to represent 0.4. He then replaced 1 rectangle with 10 squares and
crossed out 3 squares to represent subtraction of 0.03, leaving 3 rectangles and 7 squares in his diagram.
tenths
hundredths
unbundle
Diego's Method • Noah started by drawing 4 rectangles to represent 0.4. He then crossed out 3 of rectangles to represent the
subtraction, leaving 1 rectangle in his diagram.
tenths
Noah's Method
Expand Image
1. Do you agree that either diagram correctly represents 0.4 -- 0.03? Discuss your reasoning with a partner.
2. To represent 0.4 -0.03, Elena drew another diagram. She also started by drawing 4 rectangles. She then
replaced all 4 rectangles with 40 squares and crossed out 3 squares to represent subtraction of 0.03,
leaving 37 squares in her diagram. Is diagram correct? Discuss your reasoning with a partner.
tenths
hundredths
-can anyone please help with this please I need to know this thank you!