mfm 2p review – core skills learning goals: i can round whole numbers and integers i can convert...
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MFM 2P
Review – Core Skills
Learning Goals:
I can round whole numbers and integersI can convert from a percent to a
decimalI can convert a number into a percentI can add, subtract, multiply and divide
fractions
MFM 2P
Review – Core Skills
Rounding
Look at the number to the right of the number you need to round. If the number to the right is 0-4, keep the number you need to round the same. If the number to the right is 5-9, add 1 to the number you are rounding.
MFM 2P
Review – Core Skills
Know your places!
MFM 2P
Review – Core Skills
Example: Round the following number to the nearest hundred:
1, 568.899
MFM 2P
Review – Core Skills
Example: Round the following number to the nearest tenth:
65.1234
MFM 2P
Review – Core Skills
What do you do when you need to round up the number 9? For example, round the following number to the nearest one
879.84
MFM 2P
Review – Core Skills
Converting a percent to a decimal
• Divide the percentage by 100.• Move the decimal place over two places to the left.
Examples:
1)Convert 18% to a decimal
2)Convert 3% to a decimal
MFM 2P
Review – Core Skills
Converting a decimal to a percent
• Multiply the decimal by 100.• Move the decimal place over two places to the
right.
Examples:
1)Convert 0.45 to a percent
2)Convert 1.05 to a percent
MFM 2P
Review – Core Skills
Working with Percents
Example 1:
What is 35% of 862?
In math, “of” means multiply.
1) Convert the percent to a decimal2) Multiply the decimal you just found by the other
number
MFM 2P
Review – Core Skills
Working with Percents
Example 2:
What percent did you get on a test if you got 15 questions right out of 23?
1) Divide the number you got by the total number2) Multiply your answer by 100
MFM 2P
Review – Core Skills
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Fractions
MFM 2P
Review – Core Skills
Types of Fractions:
1. Proper: When the numerator (top number) is less than the denominator (bottom number)
2. Improper: When the numerator (top number) is greater than the denominator (bottom number)
3. Mixed: When a whole number is combined with a fraction
MFM 2P
Review – Core Skills
Success Criteria for converting Mixed Fractions to Improper Fractions:• Multiply the whole number by the
denominator and add the numerator. This gives you the numerator for your improper fraction
• Keep the denominator the same• Negative signs out front of the fraction are
not involved in the calculation
MFM 2P
Review – Core Skills
Example: Convert 4
MFM 2P
Review – Core Skills
Success Criteria for converting Improper Fractions to Mixed Fractions:• Count how many times the denominator
will go into the numerator. This gives you your whole number to put in front of the fraction
• Take the remainder and use it as your numerator
• Your denominator stays the same• Leave negative signs out front
MFM 2P
Review – Core Skills
Example: Convert
MFM 2P
Review – Core Skills
Success Criteria for Adding and Subtracting Fractions:• Convert mixed fractions into improper
fractions first• Find a common denominator• Add the numerators• Keep the denominator the same
MFM 2P
Review – Core Skills
Example: 2
MFM 2P
Review – Core Skills
Success Criteria for Multiplying Fractions• Convert mixed fractions into improper
fractions first• You DO NOT need a common
denominator• Whole numbers have an imaginary
denominator of 1• Multiply the numerators• Multiply the denominators
MFM 2P
Review – Core Skills
Example: 3
MFM 2P
Review – Core Skills
Success Criteria for Dividing Fractions• Convert mixed fractions into improper
fractions first• You DO NOT need a common
denominator• Change the division sign to a
multiplication sign• Flip the second fraction• Multiply the numerators• Multiply the denominators
MFM 2P
Review – Core Skills
Example: