Siti has four pencils in her pencil case with lengths 12.3 cm, 12.13 cm, 12.03 cm and 12.31 cm. Which list shows the pencils arranged from shortest to longest?
Show Worked Solution
Worked Solution
Step 1: Rewrite all lengths with 2 decimal places.
12.3 → 12.30, 12.13 → 12.13, 12.03 → 12.03, 12.31 → 12.31
Step 2: All have whole number 12; compare tenths digits.
12.03 (0 tenths) < 12.13 (1 tenth) < 12.30 (3 tenths)
12.30 vs 12.31: same tenths, compare hundredths: 0 < 1, so 12.30 < 12.31
Step 3: Order: 12.03, 12.13, 12.30, 12.31
Answer: 12.03 cm, 12.13 cm, 12.3 cm, 12.31 cm
Correct answer: 12.03 cm, 12.13 cm, 12.3 cm, 12.31 cm
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