2.04 Addition strategies
Lesson
Are you ready?
Remembering how we can solve addition on a number line can help us with our other addition strategies. Let's try now.
Use the number line to help you find the value of $10+38$10+38.
$10+38$10+38 $=$= $\editable{}$
Learn
Let's see how to change an addition problem using the bridge to ten strategy.
Apply
Question 1
How many more do we need to add to $9$9 to get to $10$10?
Learn
The next video shows us how to use the compensation strategy to add more easily.
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Question 2
If $5+10=15$5+10=15, what is the answer to $5+12$5+12?
Remember!
- Number lines can help us visualize the jumps between numbers
- Bridging to $10$10 can help us get to $10$10, so that adding can be much quicker
- Compensation uses the answer of one problem, to find the answer to another problem