Math Drills

Length (cm, mm, m) Review

D-3

Word Problems (1)

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What this worksheet covers

Grade: Grade 2 (Elementary School)
Topic: Length (cm, mm, m)

Everything rests on two relationships: one tenth of 1 cm is 1 mm, and 100 cm is 1 m. Starting from Measuring with a Ruler, children restate lengths between cm and mm and between m and cm, then add and subtract within one unit and across units, including the cases that carry and borrow.

Writing 8 cm 5 mm as 805 mm rather than 85 mm stands out, since the cm part is not multiplied by 10 during the conversion. In subtraction that needs borrowing, 1 cm is never exchanged for 10 mm, so the mm parts are subtracted smaller from larger and the mm in the answer comes out too big.

From a stage that only compared the lengths of objects, this unit moves on to expressing length as a number. The sense of lining up ends to compare, built in Comparing Length, becomes the foundation for measuring with units such as cm and mm, and the units keep growing into Length (km and Tape Measure) in grade 3, where km enters the picture.

Addition (Same Units) · cm (Word Problems)1 question
Addition (Same Units) · m (Word Problems)1 question
Addition (Different Units) · m, cm (Word Problems)1 question
Addition (Different Units) · cm, mm (Word Problems)1 question
Subtraction (Different Units) · m, cm (Word Problems)1 question
Subtraction (Different Units) · cm, mm (Word Problems)1 question

Questions & answers

Problems and answers on this worksheet

These are the problems in “Length (cm, mm, m)”, shown with their answers.

(1)In Ethan's pencil case, there are pencils of 19cm and 7cm. Altogether, how many cm is it? Answer □
Answer: 26cm
(2)On the desk, there is a 7m ribbon and a 8m ribbon. How many m are there in all? Answer □
Answer: 15m
(3)At the birthday party, there is a tape that is 7m15cm and another that is 1m20cm. Altogether, how many m and how many cm will it be? Answer □ □
Answer: 8m, 35cm
(4)The length of the umbrella is 20cm3mm, and the length of the pole is 8cm4mm. Altogether, how long are they, in how many cm and how many mm? Answer □ □
Answer: 28cm, 7mm
(5)At home, Noah found 11m30cm of red tape. After cutting off 8m10cm, how many m and cm are left? Answer □ □
Answer: 3m, 20cm
(6)At the store, Grace bought 23cm8mm of blue tape. After using 15cm3mm, how much will be left? How many cm and how many mm? Answer □ □
Answer: 8cm, 5mm

What to do next

Comparing Length and UnitsComparing Length and Units Reading

Next unit: Capacity (L, dL, mL)

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