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Parts Unknown Problems

Directions:  Complete the story problem and answer statement.

Version 1 (Difficult)
Lucy has _____ apples. She has nine _____ (more/less) than Marcus. How many apples does _____ (Lucy/Marcus) have?

_____ (Lucy/Marcus) has _____ apples.

Version 2 (Medium Difficulty)
Lucy has _____ apples. She has nine less than Marcus. How many apples does _____ (Lucy/Marcus) have?

_____ (Lucy/Marcus) has _____ apples.

Version 3 (Easy)
Lucy has _____ apples. She has nine more than Marcus. How many apples does Marcus have?
Marcus has _____ apples.

Hint

Hint

Who has more in your problem, Lucy or Marcus?
Should you adjust how many apples Lucy has in the beginning?
How many apples does it make sense for Lucy to have in a “more” problem?
How many apples does it make sense for Lucy to have in a “less” problem?

Challenge: Complete the statement using only numbers within 20.

Answer

Answer

Multiple Correct Answers:
Lucy has 11 apples. She has nine more (more/less) than Marcus. How many apples does Marcus (Lucy/Marcus) have?
Marcus (Lucy/Marcus) has 2 apples.

Lucy has 12 apples. She has nine less (more/less) than Marcus. How many apples does Marcus (Lucy/Marcus) have?
Marcus (Lucy/Marcus) has 21 apples.

Source:  Shelah Feldstein

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