Decimals 3

 Dazzling Decimals

We are learning to add and subtract up to three decimal places. We are learning to convert between fractions, decimals, and percentages.

 Noel and Margaret each had a salary of $60 000 in 2008.

Noel’s salary increased by 11% in 2009 and then increased 6% in 2010. 70596

Margaret’s salary was increased by 6% in 2009 and then increased by 11% in 2010. 70596

Who had the greater salary in 2010? Make a guess then check your guess with a calculation. They have an equal salary.

 A person decides to go on a diet. To get to a healthy weight they must reduce their food intake by 15%. An average intake is 9200 kJ a

How much of a reduction in average food intake would they need, to get to a healthy weight? 1380 KJ 

 A real estate agent is paid a commission for selling a house.

The commission is based on:

Sales for: the first $300 000, the commission is 3.95%

amounts above $300 000, the commission is 2%

How much would be paid to an agent who sells a house for $757 000? 15,140 

Flash Addition!

 114 + 97=221

 93 + 289=382

 128 + 87=215 

163 + 84=247

 311 + 93=404

Change to fractions and decimals

1. 21% 0.21 21/100

2. 19% 0.19 19/100

3. 35% 0.35 35/100

4. 63% 0.63 63/100

5. 40% 0.4 40/100

6. 15% 0.15 15/100

7. 75% 0.75 75/100 

8. 83% 0.83 83/100

9. 7% 0.07 7/100

10. 1% 0.01 1/100

Change to percentages

½ 50%

⅗ 60%

17/20 85%

41/ 50 82%

7/10 70%

⅓ 33.3%

⅚ 83.33%

2/7 28.57%

14/35 28%

26/71 36.6197%

1/25 4%

5/50 10%

1. 35 + 97= 132 

2. 3.25 - 1.17=2.08 

3. 2 × -8=16

4. 5 × (2 + 4 × 3)=60 

5. 5.789 - 1.345=4.444

6. 1.789 - 0.987=0.802 

7. 1.67 + 5.895= 7.565

8. 1.578  + 2.654 = 4.232

9. 7.678 - 3.567 =4.111

10. 4.789 + 1.678= 6.467