What is a scale? Circle all the measuring instruments used to weigh objects.

Here are the answers to the questions about weight:

1. What do we weigh with measuring instruments?

Measuring Instrument	Give an example what you can weigh with
Spring scale	Meat, fish, luggage
Kitchen scale	Baking ingredients, fruit, vegetables
Bathroom scale	A person's body weight
Balance scale	Small objects, chemicals

2. Answer the following:

• a. How many grams are there in a kilogram? $$1 \text{ kilogram} = \boxed{1000 \text{ grams}}$$
• b. How many grams are there in $2.4 \text{ kilograms}$? $$2.4 \text{ kg} = 2.4 \times 1000 \text{ g} = \boxed{2400 \text{ grams}}$$
• c. How many grams are there in $100 \text{ kilograms}$? $$100 \text{ kg} = 100 \times 1000 \text{ g} = \boxed{100000 \text{ grams}}$$
• d. How many kilograms is $23,500 \text{ grams}$? $$23,500 \text{ g} = \frac{23,500}{1000} \text{ kg} = \boxed{23.5 \text{ kilograms}}$$
• e. How many kilograms is $40,250 \text{ grams}$? $$40,250 \text{ g} = \frac{40,250}{1000} \text{ kg} = \boxed{40.25 \text{ kilograms}}$$

3. What do you see around you that weighs about 1 kilogram?

• A bag of flour
• A 1-liter bottle of water
• A small bag of potatoes
• A brick

4. Look at these things. Estimate how much each one weighs.

• a. Tennis ball: $\boxed{60 \text{ grams}}$
• b. Medium sized dog: $\boxed{15 \text{ kilograms}}$
• c. Car: $\boxed{1200 \text{ kilograms}}$
• d. Sport shoes (a pair): $\boxed{800 \text{ grams}}$