Division: Multiplication's Opposite Operation
Year 4 Mathematics Understanding the Inverse Relationship 45-minute lesson
What We Already Know
We can multiply numbers to find totals 6 × 4 = 24 Arrays help us see multiplication Multiplication facts up to 10 × 10
Think About This...
If 6 × 4 = 24 How could we 'undo' this multiplication? What if we started with 24 and wanted to find the groups?
Division: The Opposite Operation
Division 'undoes' multiplication 24 ÷ 6 = 4 (because 6 × 4 = 24) Division means sharing equally We can use multiplication facts to solve division
Let's Practice Together
Look at this array: 5 rows of 6 dots Write the multiplication: 5 × 6 = 30 Now write the division: 30 ÷ 5 = 6 Try another: 30 ÷ 6 = 5
Multiplication and Division Partners
{"left":"3 × 8 = 24\n7 × 5 = 35\n4 × 9 = 36\n6 × 7 = 42","right":"24 ÷ 3 = 8\n35 ÷ 7 = 5\n36 ÷ 4 = 9\n42 ÷ 6 = 7"}
Your Turn: Solve and Connect
Solve: 42 ÷ 7 = ? What multiplication fact helps you? Try: 54 ÷ 9 = ? Which multiplication fact did you use?
Remember This Key Idea
Division is multiplication's opposite operation When you know your multiplication facts, division becomes much easier!