Decimals and Metric Units
Written by Adi Ackerman, Head Teacher
"Decimals and Metric Units" is written for 4th Grade (Ages 9-10), and it covers Common Core 4.MD.A.1. If your little one is a year younger but already steady on decimals, the page still works. You may just need to read the instructions out loud. And if they are older and decimals in measurement never quite stuck, this is a short review rather than busywork.
4th grade math worksheet: change meters to centimeters and centimeters to millimeters with decimals. Answer key included. Part of our decimals in measurement collection. Aligned to Common Core standards.
How do I use this worksheet?
Keep a real centimeter ruler next to the page so your child can match the marks. Ask how many small marks make 1 cm before starting. Check with the answer key and measure one real object together at the end.
What students will practice
- Students will convert meters to centimeters and centimeters to millimeters.
- Students will read a centimeter ruler to the nearest tenth.
- Students will write measured lengths as decimals.
Curriculum Links
Common Core State Standards
Measurement and Data · 4th Grade
Standard: Know relative sizes of measurement units within one system of units including km, m, cm; kg, g; lb, oz.; l, ml; hr, min, sec.
View all 4.MD.A.1 worksheets →Find this in the curriculum
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FAQ
How do I use this decimals in measurement worksheet?
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Keep a real centimeter ruler next to the page so your child can match the marks. Ask how many small marks make 1 cm before starting. Check with the answer key and measure one real object together at the end.
What does this worksheet teach?
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Change meters to centimeters and centimeters to millimeters with decimals. A meter (m), centimeter (cm) and millimeter (mm) are metric units of length. 1 m = 100 cm and 1 cm = 10 mm. The directions on the page read: Change each length to the smaller unit. Then, write the answer. Finish every problem. The page opens with a worked example, and the answer key shows every answer.
Can I use this decimals in measurement worksheet for homeschool or classroom?
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Yes, both. We made it for 4th Grade decimals, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with decimals in measurement. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.
How do decimals show up in measurement?
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A centimeter ruler has 10 small marks in each centimeter, so each mark is 0.1 cm. A bar that ends 4 marks after 2 cm is 2.4 cm long. Metric units also use decimals: 0.2 m is 20 cm.
How many centimeters are in a meter?
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100 centimeters make 1 meter and 10 millimeters make 1 centimeter. To change meters to centimeters, multiply by 100: 6 m is 600 cm.
How can I practice this at home?
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Measure small objects with a centimeter ruler and say the length as a decimal, like 7.5 cm. Then measure the same object in millimeters (75 mm) to see the two names for one length.
Which standards do these worksheets support?
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The conversion page supports CCSS 4.MD.A.1 (relative sizes of measurement units) and the ruler page supports 4.MD.A.2 (measurement problems with decimals).
What decimal skills do 4th graders learn?
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4th graders learn decimals as another way to write tenths and hundredths (CCSS 4.NF.C.6). They write fractions like 7/10 and 37/100 as 0.7 and 0.37, place decimals on number lines and grids, and compare two decimals to hundredths using >, < and = (4.NF.C.7). Money and metric lengths give the decimals everyday meaning.
How do you compare decimals in 4th grade?
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Line up the decimal points and compare place by place from the left: ones, then tenths, then hundredths. Writing 0.5 as 0.50 makes it easy to see that 0.5 is greater than 0.47.
Do 4th graders add decimals?
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Yes, in a limited way. They add tenths and hundredths by writing tenths as hundredths (3/10 + 4/100 = 34/100), which is 4.NF.C.5. Adding and subtracting decimals with the standard method is a 5th grade skill.
Is there an answer key for each worksheet?
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Yes. Every one of the 30 new decimals sheets has an answer key, and the two page sheets have a two page key.
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