Adding 2-Digit Numbers: Jump Strategy
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Adding 2-Digit Numbers: Jump Strategy
Year 2 Mathematics Using the Number Line Building Number Sense
WALT (We Are Learning To)
Add 2-digit numbers using the jump strategy Use a number line to show our thinking Break numbers into tens and ones Explain our mathematical reasoning
Success Criteria
I can identify tens and ones in 2-digit numbers I can make jumps of 10 and 1 on a number line I can add two 2-digit numbers step by step I can explain my thinking to others
What is the Jump Strategy?
A way to add numbers by jumping on a number line We break numbers into tens and ones We make big jumps for tens We make small jumps for ones
Let's Practice: 23 + 15
Start at 23 on the number line Jump 10 to reach 33 Jump 5 more to reach 38 23 + 15 = 38
Breaking Down Numbers
{"left":"34 = 30 + 4\n27 = 20 + 7","right":"56 = 50 + 6\n43 = 40 + 3"}
Guided Practice: 42 + 26
Start at 42 Add 20 (jump to 62) Add 6 (jump to 68) Answer: 68
Your Turn to Think!
How would you solve 35 + 23? What jumps would you make? Talk to your partner about your strategy
Extension Activities
Try adding three 2-digit numbers Create your own number line problems Teach the strategy to someone at home Use the strategy with numbers to 100
Today We Learned
The jump strategy helps us add 2-digit numbers We break numbers into tens and ones Big jumps for tens, small jumps for ones Number lines help us show our thinking