2. SCO A7: Students will be expected to read and represent decimals to thousandths.

3. Introductory Activity 1: Draw a number line with a starting point of 2 and an ending point of 4. Examine the following list of decimal numbers so that you can properly ‘preheat’ your number line. 2.51 3.490 2.3 2.999 3.013.4093.75 Next, place each decimal number at its correct position on the line. Be prepared to explain your thinking.

4. Introductory Activity 2: Making the connection between decimals and fractions: Suzanne went to the store and bought 6.25 L of juice for a birthday party. How is this amount read? How is this amount read as a fraction? What is another fraction we can use to represent this amount? How is the amount 4.75 kg read as a decimal and as a fraction? What other fraction represents this amount?

5. Introductory Activity 3: Decimal numbers can be used to represent very large numbers. For example, the number 5.1 million represents the number: 5 100 000 What large number does 3.4 million represent? What large number does 3.5 million represent? What large number does 3.54 represent?

6. Introductory Activity 4: Estimating and Reading Numbers 18.5 can be read as 18 and 5 tenths or more usually as 18 and ½ How can the number 6.497 be read as a fraction? What everyday fraction is this amount close to? (about ____) 48.73 is about ???? 12.254 is about ????

7. Student Activities A7.1 Work with a partner. Take turns tossing three dice. Make the largest number you can using the digits to represent tenths, hundredths, and thousandths. Show this same number using base-ten blocks. How much would need to be added to this amount to make one whole?

8. Student Activities A7.2 Examine the different displays of combinations of base-ten blocks. Record the five decimals shown if the large cube represents 1 whole.

9. Student Activities A7.3 Gasoline is priced at 75.9 cents per litre. What part of a dollar is this? Home heating oil is priced at 65.7 cents per litre. What part of a dollar is this?

10. Student Activities A7.4 Write the decimal numbers for “two hundred fifty-six thousandths” and “two hundred and fifty-six thousandths”. Explain why watching and listening for “and” is important when interpreting numbers.

11. Student Activities A7.5 Newspapers sometimes use decimal numbers to record numbers. For example, a newspaper might use 2.5 million instead of 2 500 000. Do you think this is a good idea or not? How might a newspaper show 4 300 000 using a decimal number? What about 7 540 000?

12. Student Activities A7.6 A student was given the instructions: “Please cut 3.25 metres of ribbon for me.” How many centimetres of ribbon is this? How do you know?

13. Student Activities A7.7 I was thirsty and drank 0.485 litres of water. How much more would I have had to drink to equal 0.5 L?

14. Student Activities A7.8 Examine newspapers and magazines to see when 0.5 and ½ are used.

15. Student Activities A7.9 Write four different decimal numbers that have tenths, hundredths, and thousandths. Make base-ten pictures that would represent these numbers. For each amount, tell how much more would be needed to have a whole cube. Write this showing using a subtraction sentence.