**Weight Units and Conversions:**
1 g = 1,000 mg (milligrams)
1 kg = 1,000 g (grams)
100 kg = 1 quintal
10 quintals = 1 tonne
1,000 kg = 1 tonne
**How to Convert:**
**Adding and Subtracting Weights:**
Group by unit or convert to same unit first.
Example: 2 kg 500 g + 1 kg 750 g = 3 kg + 1,250 g = 4 kg 250 g
**Reading Weighing Scales:**
Always check the zero point first. The pointer shows the weight. Different scales may have different zero positions.
**Diagrams to Remember:** Double number lines showing kg-to-g conversion and scale markings at 250g, 500g, 750g positions.
**Don't Confuse:** 5 kg 50 g is NOT 5,050 g—it equals 5,050 g only when fully converted. Milligrams (mg) are for tiny things, grams for light things, kilograms for normal objects.
Q1. How many grams are there in 4 kg?
Answer: B — To convert kilograms to grams, multiply by 1,000, so 4 kg = 4 × 1,000 = 4,000 g.
Q2. Which object's weight is recorded correctly?
Answer: D — A rice bag of 5 kg is correct; the almirah, sofa, and refrigerator are much heavier than 40g, 30g, and 50g respectively.
Q3. What is 6 kg 750 g expressed in grams?
Answer: C — Convert 6 kg to grams (6,000 g) and add 750 g: 6,000 g + 750 g = 6,750 g.
Q4. If 1 kg = 1,000 g, how many kilograms is 9,000 g?
Answer: C — To convert grams to kilograms, divide by 1,000: 9,000 g ÷ 1,000 = 9 kg.
Q5. What is the total weight when 3 kg 200 g and 2 kg 800 g are added?
Answer: B — 3 kg + 2 kg = 5 kg, and 200 g + 800 g = 1,000 g = 1 kg, so total is 5 kg + 1 kg = 6 kg.
Q6. Which is heavier: 7 kg 200 g or 7,200 g?
Answer: C — 7 kg 200 g = 7,000 g + 200 g = 7,200 g, so both are equal in weight.
Q7. How much is 8 g in milligrams?
Answer: C — To convert grams to milligrams, multiply by 1,000: 8 g = 8 × 1,000 = 8,000 mg.
Q8. If the king donates 800 kg of wheat and this equals 10 times his weight, what is his weight?
Answer: A — If 10 times his weight = 800 kg, then his weight = 800 kg ÷ 10 = 80 kg.
Q9. What is 1 tonne equal to in kilograms?
Answer: C — 1 tonne = 1,000 kg, which is the standard conversion for the heaviest weight unit.
Q10. Rathna bought 2 kg 500 g rice for daily use and 1 kg 750 g for Pongal. How much total rice did she buy?
Answer: B — Add separately: 2 kg + 1 kg = 3 kg, and 500 g + 750 g = 1,250 g = 1 kg 250 g, so total is 4 kg 250 g.
What is the relationship between kilograms and grams?
1 kilogram (kg) equals 1,000 grams (g), so to convert kg to g, multiply by 1,000.
How do you convert 3 kg 500 g to grams only?
3 kg 500 g = 3,000 g + 500 g = 3,500 g (multiply the kg by 1,000 and add the grams).
What is a milligram and when is it used?
A milligram (mg) is a very small unit of weight; 1 gram = 1,000 milligrams, used for light things like medicine or gold ornaments.
How do you add weights like 2 kg 500 g + 1 kg 750 g?
Group the kilograms and grams separately: 2 kg + 1 kg = 3 kg, and 500 g + 750 g = 1 kg 250 g, so total is 4 kg 250 g.
What is the difference between a quintal and a tonne?
1 quintal = 100 kg, and 1 tonne = 10 quintals = 1,000 kg, so a tonne is 10 times heavier than a quintal.
How do you read a weighing scale correctly?
Always find where the pointer is pointing and read from the zero mark on that particular scale.
Convert 10 g 500 mg into milligrams only.
10 g 500 mg = 10,000 mg + 500 mg = 10,500 mg (multiply g by 1,000 and add the mg).
Which unit should you use to weigh rice for cooking at home?
You should use kilograms (kg) or grams (g), like 2 kg 500 g of rice, because rice is not very light.
How do you subtract weights like 10 kg - 4 kg 500 g?
Convert to the same unit (10 kg = 10,000 g), then subtract: 10,000 g - 4,500 g = 5,500 g = 5 kg 500 g.
What does the scale show if an ant weighs 3 milligrams?
The scale shows 3 mg, which is extremely tiny and used only for measuring very light objects like ants or medicine powder.
What is 5 kg 250 g in grams? [1 mark]
Convert kg to g by multiplying by 1,000, then add the grams: 5 kg = 5,000 g, plus 250 g.
Fill in the blanks: 1 kg = _____ g and 1 g = _____ mg. Convert 3 kg 500 g into grams. [2 marks]
1 kg = 1,000 g and 1 g = 1,000 mg. For 3 kg 500 g: multiply 3 by 1,000 and add 500.
A fruit stall owner has apples weighing 2 kg 500 g and oranges weighing 3 kg 750 g. What is the total weight of fruit? Explain your method. [3 marks]
Add the kilograms together and the grams together separately: group kg with kg and g with g. When grams exceed 1,000, convert to kg.
A grocery store sells rice in three bags: 5 kg 200 g, 8 kg 900 g, and 12 kg 600 g. (a) Find the total weight of rice. (b) If the storekeeper had 30 kg rice, how much was sold? Show your working step by step. [5 marks]
Part (a): Add all three weights by grouping kg and g separately. Part (b): Subtract the total weight sold from 30 kg by converting to the same unit if needed.
True or False: 4 kg 100 mg = 4,100 g. Give a reason for your answer. [2 marks]
Remember that 1 kg = 1,000 g and 1 g = 1,000 mg. 4 kg 100 mg means 4 kg and 100 milligrams, not 100 grams.
Practice with interactive flashcards, mind maps, upload your own chapters and get AI study kits instantly
Try StudyOS Free →