Math Study Help (Grade 9 LD)

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Intro to elementary mathematics

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The Number System

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MTE 180 - Melissa Grieve

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Math Study Help (Grade 9 LD)

Rounding (Hundreds and Tens)

Rounding to the nearest ten: 56=60 , 42=40 , 97=100

Rounding to the nearest hundred: 384=400 , 249=200 , 123=100

How much do we pay for sale price items?

Find the sale price: 149.99 - 22.50 = 127.49

What is the 15%? 149.99 * 0.15 (change percent to a decimal) =$22.50

A Hockey stick is 149.99 and is 15 percent off.

Changing a decimal to a percent

Example: 0.07 * 100 = 7%

Example: 0.9 * 100 = 90%

Example: 0.625 (multiply by 100) * 100 = 62.5%

M, Km, Cm, Mm, Inches, Feet

1 metre = 3.28 feet

12 Inches = 1 foot

1 centimeter = 10 milimetres

1 Metre = 100 cetimetres

1 Kilometre = 1000 metres

Main topic

Kg, G, Mg

Milo grams to Grams = amount * 1000

1 Gram = 1000 Mg

1 Kilogram = 1000 Grams

How much is tax on an item?

Add the two together to get total price. 34 + 4.42 = 38.42

34 * 0.13 (Change 13% to a decimal) = 4.42

Always remember tax is 13%

$34 baseball bat, how much is the tax?

Percentages left to pay

100% - 25% = 75% left to pay.

A Keyboard is 25% off how much do we have left to pay?

We always start with 100%

Changing a Fraction to a decimal

Example: 5/8 = 0.625

Example: 1/5 = 0.2