# Starter However you like, multiply out: 11 x 25 11 x 71 11 x 34 11 x 42 11 x 1411 x 83.

## Presentation on theme: "Starter However you like, multiply out: 11 x 25 11 x 71 11 x 34 11 x 42 11 x 1411 x 83."— Presentation transcript:

Starter However you like, multiply out: 11 x 25 11 x 71 11 x 34 11 x 42 11 x 1411 x 83

Percentages Lesson Objective: To calculate the percentage of an amount WITHOUT a calculator. Success Criteria Divide by 10 Find 10%, 20%, 30% etc. Know how to find 5%, 1% and combinations Friday May 9 2014

What will we learn today? A question about today’s lesson you would like answered Two things I know already Three new things I have learned To be completed at THE END NAME:_____________

Why do we need to know percentages of amounts?

To calculate percentages: We need to make sure we can divide by 10. 350 ÷ 10 9000 ÷ 10 62900 ÷ 10 30 ÷ 10 7 ÷ 10 21.2 ÷ 10

Percentages of Amounts Example: How can you calculate 10% of 80? 100% = 80 10% = 8 ÷ 10

Finding 10% of a number 10 % is the same as dividing by 10. On your own: a)10% of 350 kg = b)10% of 20 L = c)10% of 10 000 hours = d)10% of £900?

Percentages of Amounts On your own… (a) (b) 10% (c) OR Move decimal point one left ÷ 10 10% of £40 10% of \$180 10% of £57(d) 10% of £472 (e) (f) (g) 20% of 50m 20% of 190km 30% of 40cm(h) 30% of 90mm (i) (j) (k) 40% of 80min 60% of 70hours 80% of 20days(l) 90% of 30years = £4 = \$18 = £5.70 = £47.20 10% = 5m 10% = 5m 10% = 19km 10% = 19km 10% = 4cm 10% = 4cm 10% = 9mm 10% = 9mm x4 10% = 8min 40% = x4 32min x6 10% = 7hours 60% = x6 42hours x8 10% = 2days 80% = x8 16days x9 10% = 3years 90% = x9 27years 10% = 4cm 10% = 9mm

Percentages of Amounts If you can find 10% of a number, you can find 5% and 1% How?

Percentages of Amounts Example: Find 5% of 140 100% = 140 10% = 5% = 14 7 ÷ 10 ÷ 2

Percentages of Amounts Example: Find 1% of 1500 100% = 1500 10% = 150 1% = 15 ÷ 10

Can you use this information to find: 12% of 1800? 10% = 180 1% = 18 12% = 10% + 1% + 1% 12% = 180 + 18 + 18 12% = 216

Can you use this information to find: 35% of 280 10% = 28 5% = 14 35% = 10% + 10% + 10% + 5% 35% = 28 + 28 + 28 + 14 35% = 98

Core KILLER 1) 28% of £200 = 2) 63% of £500 = 3) 19% of £400 = 4) 37% of £80 = 5) 82% of £54 = 6) 51% of £40 = 7) 4% of £90 = 8) 23% of £6 = 1)10% of £80 = 2)10% of £130 = 3)10% of £36 = 4)20% of £60 = 5)20% of £62 = 6)30% of £70 = 7)30% of £180 = 8)40% of £360 = Extension 1)62% of £90 = 2)71% of £410 = 3)85% of £40 = 4)90% of £800 = 5)5% of £1480 = 6)35% of £80 = 7)45% of £90 = 8) 15% of £400 = Independent Task

How can we use this today?

Sales Tax

Percentages Lesson Objective: To calculate the percentage of an amount WITHOUT a calculator. Success Criteria Divide by 10 Find 10%, 20%, 30% etc. Know how to find 5%, 1% and combinations Friday May 9 2014

What will we learn today? A question about today’s lesson you would like answered Two things I know already Three new things I have learned

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