Primary / Middle School (Class 3–5) Type of practice: Mental Math Unit Conversion Comparison Questions

Mental Math Worksheet : 


Conversions


1) Q:  1 m = ___ cm. āĻĒā§ā§°āĻļā§āĻ¨: 1 āĻŽāĻŋāĻŸāĻžā§° = ___ āĻšā§‡.āĻŽāĻŋ.
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 100 cm
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 metre has 100 centimetres. 1 āĻŽāĻŋāĻŸāĻžā§°āĻ¤ 100 āĻšā§‡.āĻŽāĻŋ. āĻĨāĻžāĻ•ā§‡āĨ¤


2) Q: 500 cm = ___ m. āĻĒā§ā§°āĻļā§āĻ¨: 500 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 5 m
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 100 cm = 1 m → 500 ÷ 100 = 5. 100 āĻšā§‡.āĻŽāĻŋ. = 1 āĻŽāĻŋāĻŸāĻžā§° → 500 ÷ 100 = 5


3) Q: 2 km = ___ m. āĻĒā§ā§°āĻļā§āĻ¨: 2 āĻ•āĻŋ.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 2000 m
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 km = 1000 m → 2 × 1000 = 2000. 1 āĻ•āĻŋ.āĻŽāĻŋ. = 1000 āĻŽāĻŋ. → 2 × 1000 = 2000


4) Question: 750 m = ___ km. āĻĒā§ā§°āĻļā§āĻ¨: 750 āĻŽāĻŋāĻŸāĻžā§° = ___ āĻ•āĻŋ.āĻŽāĻŋ.
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 0.75 km
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 750 ÷ 1000 = 0.75


5) Q: 1 kg = ___ g. āĻĒā§ā§°āĻļā§āĻ¨: 1 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 1000 g Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 kilogram has 1000 grams. 1 āĻ•āĻŋ.āĻ—ā§ā§°āĻž.āĻ¤ 1000 āĻ—ā§ā§°āĻžāĻŽ āĻĨāĻžāĻ•ā§‡āĨ¤


Fill in the Blanks


6) Q: 250 g = ___ kg. āĻĒā§ā§°āĻļā§āĻ¨: 250 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 0.25 kg
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 250 ÷ 1000 = 0.25


7) Q: 3 kg = ___ g. āĻĒā§ā§°āĻļā§āĻ¨: 3 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 3000 g


Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 3 × 1000 = 3000


8) Q: 1 litre = ___ ml. āĻĒā§ā§°āĻļā§āĻ¨: 1 āĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 1000 ml
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 litre has 1000 ml. 1 āĻ˛āĻŋāĻŸāĻžā§°āĻ¤ 1000 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° āĻĨāĻžāĻ•ā§‡āĨ¤


9) Q: 200 ml = ___ litre. āĻĒā§ā§°āĻļā§āĻ¨: 1200 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻ˛āĻŋāĻŸāĻžā§°
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 1.2 litre
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1200 ÷ 1000 = 1.2


10) Q: 5 hours = ___ minutes. āĻĒā§ā§°āĻļā§āĻ¨: 5 āĻ˜āĻŖā§āĻŸāĻž = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 300 minutes
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 hour = 60 minutes → 5 × 60 = 300. 1 āĻ˜āĻŖā§āĻŸāĻž = 60 āĻŽāĻŋāĻ¨āĻŋāĻŸ → 5 × 60 = 300


Mental Calculation


11) Q:: 3000 g = ___ kg. āĻĒā§ā§°āĻļā§āĻ¨: 3000 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 3 kg
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 3000 ÷ 1000 = 3


12) Q: 4 km 500 m = ___ m. āĻĒā§ā§°āĻļā§āĻ¨: 4 āĻ•āĻŋ.āĻŽāĻŋ. 500 āĻŽāĻŋ. = ___ āĻŽāĻŋ.
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 4500 m


Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 4 km = 4000 m → 4000 + 500 = 4500. 4 āĻ•āĻŋ.āĻŽāĻŋ. = 4000 āĻŽāĻŋ. → 4000 + 500 = 4500


13) Q: 2 litres 250 ml = ___ ml. āĻĒā§ā§°āĻļā§āĻ¨: 2 āĻ˛āĻŋāĻŸāĻžā§° 250 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 2250 ml
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 2 litres = 2000 ml → 2000 + 250 = 2250. 2 āĻ˛āĻŋāĻŸāĻžā§° = 2000 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° → 2000 + 250 = 2250


14) Q: 1 hour 45 minutes = ___ minutes. āĻĒā§ā§°āĻļā§āĻ¨: 1 āĻ˜āĻŖā§āĻŸāĻž 45 āĻŽāĻŋāĻ¨āĻŋāĻŸ = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 105 minutes
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 60 + 45 = 105


15) Q: 150 cm = ___ m. āĻĒā§ā§°āĻļā§āĻ¨: 150 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°
Ans  / āĻ‰āĻ¤ā§āĻ¤ā§°: 1.5 m
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 150 ÷ 100 = 1.


Think & Compare


16) Q: Which is heavier: 750 g or 1 kg ? āĻĒā§ā§°āĻļā§āĻ¨: āĻ•ā§‹āĻ¨āĻŸā§‹ āĻŦā§‡āĻ›āĻŋ āĻ­āĻžā§°ā§€ – 750 āĻ—ā§ā§°āĻžāĻŽ āĻ¨ā§‡ 1 āĻ•āĻŋ.āĻ—ā§ā§°āĻž.?
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 1 kg
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 kg = 1000 g, which is more than 750 g. 1 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = 1000 āĻ—ā§ā§°āĻžāĻŽ, āĻ¯āĻŋ 750 āĻ—ā§ā§°āĻžāĻŽāĻ¤āĻ•ā§ˆ āĻŦā§‡āĻ›āĻŋāĨ¤


17) Q: Which is longer: 2 km or 1500 m ? āĻĒā§ā§°āĻļā§āĻ¨: āĻ•ā§‹āĻ¨āĻŸā§‹ āĻĻā§€āĻ˜āĻ˛ – 2 āĻ•āĻŋ.āĻŽāĻŋ. āĻ¨ā§‡ 1500 āĻŽāĻŋ. ?
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 2 km
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 2 km = 2000 m, which is more than 1500 m. 2 āĻ•āĻŋ.āĻŽāĻŋ. = 2000 āĻŽāĻŋ., āĻ¯āĻŋ 1500 āĻŽāĻŋ.āĻ¤āĻ•ā§ˆ āĻŦā§‡āĻ›āĻŋāĨ¤


18) Q: How many centimetres are there in half a metre ? āĻĒā§ā§°āĻļā§āĻ¨: āĻ†āĻ§āĻž āĻŽāĻŋāĻŸāĻžā§°āĻ¤ āĻ•āĻŋāĻŽāĻžāĻ¨ āĻšā§‡.āĻŽāĻŋ. āĻĨāĻžāĻ•ā§‡ ?
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 50 cm
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: Half of 100 cm = 50 cm. 100 āĻšā§‡.āĻŽāĻŋ.ā§° āĻ†āĻ§āĻž = 50 āĻšā§‡.āĻŽāĻŋ.


19) Q: How many millilitres make half a litre ?


Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 500 ml
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: Half of 1000 ml = 500 ml. 1000 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°ā§° āĻ†āĻ§āĻž = 500 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°


20) Q: Which is more: 90 minutes or 1 hour?  āĻĒā§ā§°āĻļā§āĻ¨: āĻ•ā§‹āĻ¨āĻŸā§‹ āĻŦā§‡āĻ›āĻŋ – 90 āĻŽāĻŋāĻ¨āĻŋāĻŸ āĻ¨ā§‡ 1 āĻ˜āĻŖā§āĻŸāĻž ?
Ans / āĻ‰āĻ¤ā§āĻ¤ā§°: 90 minutes
Explanation / āĻŦā§āĻ¯āĻžāĻ–ā§āĻ¯āĻž: 1 hour = 60 minutes → 90 is more . 1 āĻ˜āĻŖā§āĻŸāĻž = 60 āĻŽāĻŋāĻ¨āĻŋāĻŸ → 90 āĻŦā§‡āĻ›āĻŋ


Practice Set :


A. Conversions (Write the correct answer)



  1. 1 m = ___ cm. 1 āĻŽāĻŋāĻŸāĻžā§° = ___ āĻšā§‡.āĻŽāĻŋ.

  2. 300 cm = ___ m. 300 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°

  3. 5 km = ___ m. 5 āĻ•āĻŋ.āĻŽāĻŋ. = ___ āĻŽāĻŋ.

  4. 900 m = ___ km. 900 āĻŽāĻŋ. = ___ āĻ•āĻŋ.āĻŽāĻŋ.

  5. 2 kg = ___ g. 2 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ


B. Fill in the Blanks



  1. 750 g = ___ kg. 750 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.

  2. 4 kg = ___ g. 4 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ

  3. 1 litre = ___ ml. 1 āĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°

  4. 2500 ml = ___ litre. 2500 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻ˛āĻŋāĻŸāĻžā§°

  5. 2 hours = ___ minutes. 2 āĻ˜āĻŖā§āĻŸāĻž = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ


C. Mental Calculation



  1. 6000 g = ___ kg. 6000 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.

  2. 3 km 250 m = ___ m. 3 āĻ•āĻŋ.āĻŽāĻŋ. 250 āĻŽāĻŋ. = ___ āĻŽāĻŋ.

  3. 1 litre 500 ml = ___ ml. 1 āĻ˛āĻŋāĻŸāĻžā§° 500 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°

  4. 2 hours 30 minutes = ___ minutes. 2 āĻ˜āĻŖā§āĻŸāĻž 30 āĻŽāĻŋāĻ¨āĻŋāĻŸ = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ

  5. 200 cm = ___ m. 200 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°


D. Think & Compare



  1. Which is heavier: 900 g or 1 kg ?. āĻ•ā§‹āĻ¨āĻŸā§‹ āĻŦā§‡āĻ›āĻŋ āĻ­āĻžā§°ā§€ – 900 āĻ—ā§ā§°āĻžāĻŽ āĻ¨ā§‡ 1 āĻ•āĻŋ.āĻ—ā§ā§°āĻž.?

  2. Which is longer: 1500 m or 2 km ?. āĻ•ā§‹āĻ¨āĻŸā§‹ āĻĻā§€āĻ˜āĻ˛ – 1500 āĻŽāĻŋ. āĻ¨ā§‡ 2 āĻ•āĻŋ.āĻŽāĻŋ.?

  3. How many cm in half a metre ?. āĻ†āĻ§āĻž āĻŽāĻŋāĻŸāĻžā§°āĻ¤ āĻ•āĻŋāĻŽāĻžāĻ¨ āĻšā§‡.āĻŽāĻŋ.?


Practice sheet – 2


A. Unit Conversion



  1. 4 m = ___ cm. 4 āĻŽāĻŋāĻŸāĻžā§° = ___ āĻšā§‡.āĻŽāĻŋ.

  2. 1200 cm = ___ m. 1200 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°

  3. 7 km = ___ m. 7 āĻ•āĻŋ.āĻŽāĻŋ. = ___ āĻŽāĻŋ.

  4. 500 m = ___ km. 500 āĻŽāĻŋ. = ___ āĻ•āĻŋ.āĻŽāĻŋ.

  5. 5 kg = ___ g. 5 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ


B. Fill in the Blanks



  1. 500 g = ___ kg. 500 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.

  2. 8 kg = ___ g. 8 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. = ___ āĻ—ā§ā§°āĻžāĻŽ

  3. 2 litres = ___ ml. 2 āĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°

  4. 1800 ml = ___ litre. 1800 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻ˛āĻŋāĻŸāĻžā§°

  5. 3 hours = ___ minutes. 3 āĻ˜āĻŖā§āĻŸāĻž = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ


C. Mental Math



  1. 7000 g = ___ kg. 7000 āĻ—ā§ā§°āĻžāĻŽ = ___ āĻ•āĻŋ.āĻ—ā§ā§°āĻž.

  2. 6 km 400 m = ___ m. 6 āĻ•āĻŋ.āĻŽāĻŋ. 400 āĻŽāĻŋ. = ___ āĻŽāĻŋ.

  3. 3 litres 200 ml = ___ ml. 3 āĻ˛āĻŋāĻŸāĻžā§° 200 āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° = ___ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§°

  4. 1 hour 20 minutes = ___ minutes. 1 āĻ˜āĻŖā§āĻŸāĻž 20 āĻŽāĻŋāĻ¨āĻŋāĻŸ = ___ āĻŽāĻŋāĻ¨āĻŋāĻŸ

  5. 250 cm = ___ m. 250 āĻšā§‡.āĻŽāĻŋ. = ___ āĻŽāĻŋāĻŸāĻžā§°


D. Think & Answer



  1. Which is more: 45 minutes or 1 hour ?. āĻ•ā§‹āĻ¨āĻŸā§‹ āĻŦā§‡āĻ›āĻŋ – 45 āĻŽāĻŋāĻ¨āĻŋāĻŸ āĻ¨ā§‡ 1 āĻ˜āĻŖā§āĻŸāĻž ?

  2. Which is heavier: 2 kg or 1500 g ?. āĻ•ā§‹āĻ¨āĻŸā§‹ āĻŦā§‡āĻ›āĻŋ āĻ­āĻžā§°ā§€ – 2 āĻ•āĻŋ.āĻ—ā§ā§°āĻž. āĻ¨ā§‡ 1500 āĻ—ā§ā§°āĻžāĻŽ ?

  3. How many ml are there in half a litre ?. āĻ†āĻ§āĻž āĻ˛āĻŋāĻŸāĻžā§°āĻ¤ āĻ•āĻŋāĻŽāĻžāĻ¨ āĻŽāĻŋāĻ˛āĻŋāĻ˛āĻŋāĻŸāĻžā§° āĻĨāĻžāĻ•ā§‡ ?