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.
Margaret’s salary was increased by 6% in 2009 and then increased by 11% in 2010.
Who had the greater salary in 2010? Make a guess then check your guess with a calculation.
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 day.
How much of a reduction in average food intake would they need, to get to a healthy weight?
A real estate agent is paid a commission for selling a house.
The commission is based on:
Sales for: the first $300 000, commission is 3.95%
amounts above $300 000, commission is 2%
How much would be paid to an agent who sells a house for $757 000? 340985324
Flash Addition!
114 + 97 = 211
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% 0.40 40/100
6. 15% 0.15 15/100
7. 75% 0.75 75/100
8. 83% 0.83 83/100
9. 7% 0.7 7/100
10. 1% 0.1 01/100
Change to percentages
½ = 50%
⅗ = 60%
17/20=
41/ 50= 82%
7/10 = 70%
⅓= 33.333333333333333333333333
⅚= 25
14/35= 40%
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) = 70
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 = 4.322
9. 7.678 - 3.567 = 4.111
10. 4.789 + 1.678 = 6.467
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