Finding Fractions with Calculator Practice
Year 7 Mathematics New Zealand Curriculum 30-minute lesson
What Are Fractions?
A fraction represents part of a whole The top number is the numerator The bottom number is the denominator Example: 2/3 means 2 parts out of 3 equal parts
Reading Common Fractions
1/2 = one half 1/3 = one third 2/3 = two thirds 1/4 = one quarter 3/4 = three quarters
Quick Check: What fraction is shown?
Look at the image Identify the fraction Write your answer on your whiteboard
Finding Fractions OF Numbers
'Of' in maths means multiply (×) To find 1/2 of 18: 18 ÷ 2 = 9 To find 1/3 of 18: 18 ÷ 3 = 6 To find 2/3 of 18: (18 ÷ 3) × 2 = 12
Calculator Practice: Method 1
Find 2/3 of 18 using division method Step 1: 18 ÷ 3 = ? Step 2: Answer × 2 = ? Try this on your calculator now!
Calculator Practice: Method 2
Find 2/3 of 18 using decimal method Step 1: 2 ÷ 3 = 0.666... Step 2: 0.666... × 18 = ? Compare your answer with Method 1
Practice Problems
{"left":"Find 1/2 of 24\nFind 1/4 of 20\nFind 3/4 of 16\nFind 2/5 of 25","right":"Find 1/3 of 21\nFind 2/3 of 15\nFind 3/5 of 30\nFind 5/6 of 18"}
Challenge Question
A school has 240 students 2/3 of them walk to school How many students walk to school? Use your calculator to find the answer
Summary: Finding Fractions with Calculators
Method 1: Divide by denominator, multiply by numerator Method 2: Convert fraction to decimal, then multiply Both methods give the same answer Practice makes perfect! Remember: 'of' means multiply (×)