Math Drills

Length (cm, mm, m) Review

D-5

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)The height of the notebook is 25cm, and the width is 18cm. Altogether, how many cm is it? Answer □
Answer: 43cm
(2)In the park, there are poles of 18m and 2m. How many m are there in all? Answer □
Answer: 20m
(3)The height of the pole is 2m50cm, and the length of the flag is 1m10cm. Altogether, how many m and how many cm will it be? Answer □ □
Answer: 3m, 60cm
(4)In the warehouse, there are two strings of 8cm2mm and 1cm5mm. Altogether, how long are they, in how many cm and how many mm? Answer □ □
Answer: 9cm, 7mm
(5)At the park, Ethan picked up 3m95cm of blue rope. After cutting off 1m65cm, how many m and cm are left? Answer □ □
Answer: 2m, 30cm
(6)At the park, Hannah found 19cm5mm of blue rope. After cutting off 13cm4mm, how much will be left? How many cm and how many mm? Answer □ □
Answer: 6cm, 1mm

What to do next

Comparing Length and UnitsComparing Length and Units Reading

Next unit: Capacity (L, dL, mL)

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