Weight — g and kg

• Understand the relationship 1 kg = 1,000 g.
• Add and compare weights given in kilograms and grams.
• Solve everyday weight word problems (groceries, parcels, fruits).

Level 1 — Units of weight

Verbal: Light objects (a pencil, an apple) are weighed in grams (g); heavier objects (a bag of rice, a person) are weighed in kilograms (kg).

Level 2 — Converting kilograms to grams

Symbolic: 4 kg = 4 × 1,000 = 4,000 g. 4 kg 350 g = 4,000 + 350 = 4,350 g.

Level 3 — Adding weights

Example: A bag of rice weighs 2 kg 500 g and a bag of sugar weighs 1 kg 750 g. Total in grams = 2,500 g + 1,750 g = 4,250 g = 4 kg 250 g.

Level 4 — Comparing weights

Example: Box A = 2,300 g, Box B = 2 kg 100 g = 2,100 g. Box A is heavier by 2,300 − 2,100 = 200 g.

NCERT anchor: Math-Magic 4, Ch 12 — How Heavy? How Light? (comparing and measuring weight).

A watermelon weighs 3 kg 250 g and a papaya weighs 1 kg 600 g. What is their total weight?

Step 1 — Convert both to grams: 3,250 g and 1,600 g.
Step 2 — Add: 3,250 + 1,600 = 4,850 g.
Step 3 — Convert back: 4,850 g = 4 kg 850 g.
Answer: 4 kg 850 g.

• 6 kg = ___ g (6,000 g)
• 3 kg 400 g = ___ g (3,400 g)
• 5,200 g = ___ kg ___ g (5 kg 200 g)
• Which is heavier: 1,800 g or 1 kg 900 g? (1 kg 900 g = 1,900 g is heavier)
• Stretch: A shopkeeper has 10 kg of flour. He sells 3 kg 600 g in the morning and 2 kg 750 g in the evening. How much flour is left? (3 kg 650 g)

Revision tip: Look at grocery packet labels at home (500 g, 1 kg, etc.) and practise converting them to grams.

Open the Practice tab for graded questions on Weight.