Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75%

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

1. Increase 40 by 70% 2. Increase 320 by 24%

3. Decrease 990 by 65% 4. Decrease 680 by 11%

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

1. Increase 40 by 70% 2. Increase 320 by 24%

3. Decrease 990 by 65% 4. Decrease 680 by 11%

Old x (1 ± %) = New40 x (1 + 0.70) = New 68 = New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

1. Increase 40 by 70% 2. Increase 320 by 24%

3. Decrease 990 by 65% 4. Decrease 680 by 11%

Old x (1 ± %) = New40 x (1 + 0.70) = New 68 = New

Old x (1 ± %) = New320 x (1 + 0.24) = New 396.8 = New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

1. Increase 40 by 70% 2. Increase 320 by 24%

3. Decrease 990 by 65% 4. Decrease 680 by 11%

Old x (1 ± %) = New40 x (1 + 0.70) = New 68 = New

Old x (1 ± %) = New320 x (1 + 0.24) = New 396.8 = New

Old x (1 ± %) = New990 x (1 - 0.65) = New 346.5 = New

Increase/Decrease by a % We learn the one step method. Formula - Old x (1 ± %) =

NewSo if we are given a problems saying the sale is 25% off. We are really doing a calculation to find 75%. Because 100% - 25% is

75% e.g. The price of the surfboard is usually $750, but the shop is having a 30% sale. How much will the board actually be sold for?

Old x (1 ± %) = New750 x (1 – 0.30) = New750 x (1 – 0.30) = New750 x 0.70 = New Finding 70% of the original

$525.00 = New

1. Increase 40 by 70% 2. Increase 320 by 24%

3. Decrease 990 by 65% 4. Decrease 680 by 11%

Old x (1 ± %) = New40 x (1 + 0.70) = New 68 = New

Old x (1 ± %) = New320 x (1 + 0.24) = New 396.8 = New

Old x (1 ± %) = New990 x (1 - 0.65) = New 346.5 = New

Old x (1 ± %) = New680 x (1 - 0.11) = New 605.2 = New