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Practice each question, then open the answer or worked solution.
Guess how many children of your weight will be equal to the weight of an elephant of 5000 kg.
Weight of a child of my age = 30 kg
Weight of an elephant = 5000 kg
Total number of children weighing 5000 kg = 5000/30 = 167
At birth, a baby elephant weighs around 90 kg. How much did you weigh when you were born? Find out. How many times is a baby elephant heavier than you were at birth?
Weight of a baby elephant = 90 kg
My weight at birth = 3 kg
Number of times a baby elephant was heavier than me at birth = 90/3 = 30
So, the baby elephant was 30 times heavier than me at birth.
If a grown up elephant eats 136 kg of food in a day then it will eat around _________ kg in a month. Guess about how much it will eat in a year.
Food eaten by a grown-up elephant in 1 day = 136 kg
Food eaten by a grown-up elephant in 30 days = 30 × 136 = 4080 kg
In a year, it will eat around 50,000 kg of food.
Shahid Saves the Bank!
Shahid works in a bank. He sits at the cash counter. Whenever there are too many coins he does not count them. He just weighs them
1. How many coins are there in a sack of 5 rupee coins if it weighs:
a) 18 kg? ______
1 kg = 1000 g weight of a 5 rupee coin = 9 g
Weight of 18 kg sack in grams = 18 × 1000 = 18000 g
Number of 5 rupee coins in 18 kg sack = 18000 ÷ 9 = 2000 coins
b) 54 kg? ______
Weight of 54 kg of sack in grams = 54 × 1000 = 54000 g
Number of 5 rupee coins in 54 kg sack = 54000 ÷ 9 = 6000 coins
c) 4500 g? ______
(c) Weight of sack = 4500 g
Number of 5 rupee coins in 4500 g sack = 4500 ÷ 9 = 500 coins
d) 2 kg and 250 g? ______
Weight of 2 kg 250 g sack = 2 × 1000 g + 250 g = 2000 g + 250 g = 2250 g
Number of 5 rupee coins in 2250 g sack = 2250 ÷ 9 = 250 coins
e) 1 kg and 125 g? ______
Weight of 1 kg 125 g sack = 1 × 1000 g + 125 g = 1000 g + 125 g = 1125 g
Number of 5 rupee coins in 1125 g sack = 1125 ÷ 9 = 125 coins
2. A 2 rupee coin weighs 6 g. What is the weight of a sack with:
a) 2200 coins? _____ Kg _____ g
1 kg = 1000 g Weight of a 2 rupee coin = 6 g
Weight of sack with 2200 coins = 2200 × 6 = 13200 g = 13 × 1000 g + 200 g = 13 kg 200 g
b) 3000 coins? _____ Kg
Weight of the sack with 3000 coins = 3000 × 6 = 18000 g
Thus, 18000 g = 18 × 1000 g = 18 kg
3. If 100 one rupee coins weigh 485 g then how much will 10000 coins weigh? _____ Kg _____ g
Weight of 100 one-rupee coins = 485 g
So, weight of a single one-rupee coin = 485/100 = 4.85 g
Thus, weight of 10000 one-rupee coins = 10000 × 4.85 = 48500 g
So, 48500 g = 48 × 1000 g + 500 g = 48 kg 500 g