4th Grade Measurement Units and Conversions Worksheet Answer Key (PDF)

Q: How do you convert 55 ounces to pounds and ounces?

Divide 55 by 16. So, the quotient 3 is the number of pounds, and the remainder 7 is the number of ounces left. So 55 ounces equals 3 pounds 7 ounces. Also, check by computing 3 times 16 plus 7, which gives 55.

Q: Why does problem 17 end at a different time than a simple addition would suggest?

Minutes roll over at 60, so adding 50 minutes to 40 minutes past the hour moves into the next hour. If a movie starts at 6:40 PM and lasts 2 hours 50 minutes, it ends at 9:30 PM, not 8:90 PM.

Q: How can I check a conversion answer quickly?

Estimate whether your answer should be larger or smaller than the starting number, and convert back with the opposite operation. If 7 meters becomes 700 centimeters, dividing 700 by 100 returns 7. A matching result confirms the answer.

4th grade measurement conversions worksheet answers – Maths PDF

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This 4th grade measurement conversions worksheet answers covers measurement units and conversions (Common Core 4.MD.A.1, 4.MD.A.2), with a free PDF to print.

Key takeaway: This answer key helps fourth grade students and parents check unit conversion work and see each step.

Topic: Measurement Units and Conversions (4th grade)
Content: Step-by-step answers to 20 worksheet problems
Standards: 4.MD.A.1, 4.MD.A.2
Answers: Every step shown, with the method to review
Format: Free printable PDF, US Letter, black and white

This answer key helps fourth grade students and parents check unit conversion work and see each step. Also, each solution names the conversion fact used, shows the multiplication or addition, and writes the answer with its unit.

The key covers all 20 problems, including the conversion table in problem 9 and the comparison of jars in problem 10. For word problems, the key converts to a single unit before computing and then converts back when the question asks. Then, plan about 15 minutes to compare answers and redo any that differ. Also, check that every answer has the right unit.

Every worked solution below shows the unit fact, the multiplication or subtraction, and the final answer in bold. Check each step against your own work, and look at the diagrams to see why the numbers fit together.

Grade 4 · Common Core State Standards: 4.MD.A.1, 4.MD.A.2

4th grade measurement conversions worksheet answers: worksheet problems 1 to 10

1 – Kilometers to meters

1 km = 1,000 m, so multiply: $4 \times 1{,}000 = 4{,}000$.

4,000 m

2 – Meters to centimeters

1 m = 100 cm, so $7 \times 100 = 700$.

700 cm

3 – Kilograms to grams

Each kilogram is 1,000 g. Three blocks: $3 \times 1{,}000 = 3{,}000$.

3,000 g

4 – Liters to milliliters

1 L = 1,000 mL, so $5 \times 1{,}000 = 5{,}000$.

5,000 mL

5 – Pounds to ounces

1 lb = 16 oz, so $2 \times 16 = 32$.

32 oz

6 – Hours to minutes

Move to 3 hr on the top line. The bottom line shows 180. Check: $3 \times 60 = 180$.

180 min

7 – Minutes to seconds

1 min = 60 sec, so $5 \times 60 = 300$.

300 sec

8 – Mixed length

$2\text{ m} = 2 \times 100 = 200\text{ cm}$. Add 35: $200 + 35 = 235$.

235 cm

9 – Fill the conversion table

Multiply each number of kilograms by 1,000.

$1 \times 1{,}000 = 1{,}000$
$2 \times 1{,}000 = 2{,}000$
$6 \times 1{,}000 = 6{,}000$
$8 \times 1{,}000 = 8{,}000$

1,000 g; 2,000 g; 6,000 g; 8,000 g

10 – Compare liquid volumes

Change liters to milliliters: $2 \times 1{,}000 = 2{,}000\text{ mL}$.

Compare $2{,}000$ and $2{,}500$: 2,000 is less.

$2\text{ L} < 2{,}500\text{ mL}$

Worksheet problems 11 and up

11 – Hours and minutes

$3 \times 60 = 180$, then $180 + 20 = 200$.

200 min

12 – Pounds and ounces

$4 \times 16 = 64$, then $64 + 6 = 70$.

70 oz

13 – Minutes and seconds

$2 \times 60 = 120$, then $120 + 15 = 135$.

135 sec

14 – Which is longer?

$3\text{ m} = 300\text{ cm}$, so $3\text{ m } 5\text{ cm} = 305\text{ cm}$.

Compare $305$ and $350$: 350 is greater.

350 cm is longer.

15 – Trail walk

Change the trail to meters: $3 \times 1{,}000 = 3{,}000$, then $3{,}000 + 250 = 3{,}250\text{ m}$.

Subtract the part walked: $3{,}250 – 1{,}800 = 1{,}450$.

Check: 1,800 + 1,450 = 3,250.

1,450 m left

16 – Milk bottle

$2\text{ L} = 2{,}000\text{ mL}$.

Amount poured: $750 + 450 = 1{,}200$.

Left: $2{,}000 – 1{,}200 = 800$.

800 mL

17 – Movie time

Start at 3:15. Add 2 hours: 5:15. Add 50 minutes: 5:15 + 0:45 = 6:00, plus 5 more minutes is 6:05.

Two steps on a timeline.

6:05 PM

18 – Backpack weight

Backpack: $3 \times 16 = 48$, then $48 + 9 = 57\text{ oz}$.

Add the lunch: $57 + 12 = 69\text{ oz}$.

3 lb is 48 oz.

$69 = 4 \times 16 + 5$, so 69 oz is 4 lb 5 oz.

69 oz = 4 lb 5 oz

Worksheet problem 19 and after

19 – Ribbon cost

$250\text{ cm} = 2\text{ m } 50\text{ cm}$. Two meters cost $2 \times 6 = 12$ dollars.

50 cm is half a meter, so it costs half of $6, which is $3.

Total: $12 + 3 = 15$.

$15

20 – Cookie baking

Baking: $60 + 45 = 105\text{ min}$.

Total: $105 + 25 + 50 = 180\text{ min}$.

$180 = 3 \times 60$, so that is 3 hours. 9:30 AM + 3 hours = 12:30 PM.

180 min; he finishes at 12:30 PM

Key facts behind this 4th grade measurement conversions worksheet answers

Key facts

1 km = 1,000 m and 1 m = 100 cm.
1 kg = 1,000 g and 1 L = 1,000 mL.
1 lb = 16 oz, 1 hr = 60 min, and 1 min = 60 sec.
Larger unit to smaller unit: multiply, and the number gets bigger.
Change both amounts to the same unit before you add or subtract.

Common mistakes with this 4th grade measurement conversions worksheet answers

Students match the number but not the unit. An answer of 4,000 is not the same as 4,000 meters, so compare the labels as well.
Students skip the conversion fact in the key. Also, reading which fact was used shows whether you picked the right multiplier.
Students compare problem 15 by mixing units. The key converts kilometers to meters first, then subtracts. Slow down at that step and check it twice.
Students stop at total ounces in problem 18. The question also asks for pounds and ounces, so divide by 16 and find the remainder.

How to use these solutions

Circle the conversion fact in each key solution and check whether you used the same one. Then, a wrong fact explains most wrong answers.
Check that your answer is bigger when you go from a larger unit to a smaller unit, and smaller when you go the other way.
Parents can ask the child to explain why 3 kilograms is 3,000 grams using a set of blocks or a bag of flour.

Download the 4th grade measurement conversions worksheet answers as a PDF with the button below and keep it with your notes.

4th grade measurement conversions worksheet answers: frequently asked questions

How do you convert 55 ounces to pounds and ounces?

Divide 55 by 16. So, the quotient 3 is the number of pounds, and the remainder 7 is the number of ounces left. So 55 ounces equals 3 pounds 7 ounces. Also, check by computing 3 times 16 plus 7, which gives 55.

Why does problem 17 end at a different time than a simple addition would suggest?

Minutes roll over at 60, so adding 50 minutes to 40 minutes past the hour moves into the next hour. If a movie starts at 6:40 PM and lasts 2 hours 50 minutes, it ends at 9:30 PM, not 8:90 PM.

How can I check a conversion answer quickly?

Estimate whether your answer should be larger or smaller than the starting number, and convert back with the opposite operation. If 7 meters becomes 700 centimeters, dividing 700 by 100 returns 7. A matching result confirms the answer.

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