hw+w2t3

This week you will need to make sure your feedback comment from your parent(s) is entered in your e-portfolio. This is now overdue. Make sure your achievements page is up to date with your latest results from the Otago Problem Solving and the Australian Olympiad. Multiplying and dividing by powers of 10 1. 4.3 x 100 = 2. 8.7 ÷ 100 = 3. 9.9 x 10000 = 4. 36.4 x 10000 = 5. 632 ÷ 100 = 6. 0.63 ÷ 10 = 7. 48.3 x 1000 = 8. 6321 ÷ 100 = 9. 7.3 ÷ 1000 = 10. 0.47 x 1000 = 11. If Jan buys 10000 envelopes at 15 cents each, how much will it cost? Give your answer in dollars. 12. If Jan paid $40 for a box of 100 stamps, how much does one stamp cost? 13. If a brick fence is to be built using 100,000 bricks, how much will the bricks cost if each brick costs 60 cents?
 * E-portfolios:**

Percentage Challenge: 1. Increase 60 by 50% 2. Find the number which when decreased by 50% becomes 18 3. Decrease 60 by 50% 4. Find the number which when increased by 50% becomes 24 5. Increase 50 by 20% 6. Find the number which when decreased by 25% becomes 18 7. Find the number which when increased by 20% becomes 30 8. Decrease 50 by 20% 9. Find the number which when decreased by 20% becomes 32 10. Increase 24 by 33¹/ ³ % 11. Find the number which when increased by 33¹/ ³ % becomes 48 12. Find the number which when decreased by 33¹/ ³ % becomes 48