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Try putting your starting number into a place value grid. How many 10s do you have at the beginning? How many 1s?
Add 9 to your number and then put your answer into the place value grid. How many 10s do you have now? How many 1s?
What do you notice?
Digit Addition
Age 5 to 11
Challenge Level 
Try putting your starting number into a place value grid. How many 10s do you have at the beginning? How many 1s?
Add 9 to your number and then put your answer into the place value grid. How many 10s do you have now? How many 1s?
What do you notice?
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