1. SI Weights

2. Milligram A milligram is a very small weight
No common items weigh this little

3. Gram
1000 milligrams make a gram
What weighs a gram?

4. Kilogram
1000 milligrams make a kilogram
What weighs a kilogram?

5. Tonne
1000 kilograms makes a metric tonne
What weighs a tonne?

6. Question
A certain book weighs 340 grams. A publishing company is mailing boxes containing 20 copies of this book to various bookstores. How much does each box of books weigh in kilograms. The box itself doesn’t weigh enough to matter.
How much does 20 books weigh in grams?
340 x 20 = 6800 grams
What is 6800 grams in kilograms?
6800 ÷ 1000 = 6.8 kilograms

7. Question
Fluoride is commonly added to water at a rate of about 1 milligram per liter. If 2 million liters of water are in a water tank, how much fluoride is in the tank?
There are 2 million (2,000,000) milligrams of Fluoride
2,000,000 ÷ 1000 = 2,000 grams
2,000 ÷ 1000 = 2 kilograms

8. Converting
A kilogram is approximately 2.2 pounds

9. Question
3 kilograms is the same as how many pounds?
2.2 x 3 = 6.6

10. Question
How many kilograms is one pound?
1 ÷ 2.2 =

11. Question
A baby weighs 7 pounds, 3 ounces. How much does the baby weigh in kilograms?
7 pounds is 7 ÷ 2.2 = 3.18 kg
3 ounces is 3 ÷ 16 = pounds
÷ 2.2 =
7 pounds 3 ounces is kg
=3.27 kilograms