PUMA Keywords: Addition and Subtraction
Year 3 Mathematics Identifying Keywords in Word Problems Selecting the Correct Operation
Flashback 4 - Quick Warm Up!
304 - 15 = ? 45 + 55 = ? 3 × 5 = ? 100 less than 1,050 = ?
The Big Idea
Keywords are like secret codes that tell us which operation to use!
Building Our Keyword Bank
ADDITION Keywords: Total, altogether, sum, plus, more, increase, add SUBTRACTION Keywords: Difference, take away, minus, less, decrease, left, remaining
Guided Practice - Spot the Keywords!
Problem 1: 'Sam has 45 stickers. His friend gives him 23 more. What is the total?' Problem 2: 'There were 80 books. 35 were sold. How many are left?' Problem 3: 'Find the difference between 92 and 47.'
Quick Check - Which Operation?
Look at this sentence: 'The baker sold 45 cakes and has 23 left. How many did he start with?' What keywords do you spot? Should we add or subtract?
PUMA Challenge - Fluency
Calculate: 458 + 242 = ? 700 - 350 = ? Show your working clearly!
PUMA Challenge - Reasoning
If 450 - 120 = 330 is true... Which addition must also be true? A) 450 + 330 = 120 B) 330 + 120 = 450 Explain your thinking!
PUMA Challenge - Problem Solving
The Baker's Problem: A baker has 250 rolls Sells 85 in the morning Sells 42 in the afternoon How many rolls are left?
Today's Learning - Keywords Help Us Choose!
We learned to identify keywords in word problems Addition keywords: total, more, altogether, plus Subtraction keywords: difference, less, left, take away Keywords help us choose the right operation Always read the problem carefully!
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