Bridging Hundreds and Thousands: Add and Subtract
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Bridging Hundreds and Thousands: Add and Subtract
Year 5 Mathematics Learning to cross number boundaries with confidence
What is Bridging?
Moving across number boundaries Like crossing a bridge from one hundred to the next Helps us add and subtract larger numbers Makes mental math easier and faster
Think About This...
What happens when you count from 99 to 101? What about from 999 to 1001? How do the digits change?
Bridging When Adding - Hundreds
Start with: 67 + 45 Break it down: 67 + 33 + 12 Bridge to 100 first: 67 + 33 = 100 Then add the rest: 100 + 12 = 112
Let's Try Together!
Work out: 78 + 36 First, how much to get to 100? 78 + ? = 100 Then add the rest!
Bridging When Adding - Thousands
Example: 867 + 245 Break it down: 867 + 133 + 112 Bridge to 1000: 867 + 133 = 1000 Add the rest: 1000 + 112 = 1112
Bridging When Subtracting - Hundreds
Start with: 124 - 38 Break it down: 124 - 24 - 14 Bridge down to 100: 124 - 24 = 100 Subtract the rest: 100 - 14 = 86
Addition vs Subtraction Bridging
{"left":"Addition: 78 + 36\nBreak apart to reach next hundred\n78 + 22 + 14 = 100 + 14 = 114","right":"Subtraction: 124 - 38\nBreak apart to reach previous hundred\n124 - 24 - 14 = 100 - 14 = 86"}
Your Turn to Practice!
Try these problems: 89 + 47 = ? 156 - 69 = ? Show your bridging steps!
Remember...
"Bridging helps us break big problems into smaller, easier steps!"