4th GRADE
4.OA.B.4 Operations and Algebraic Thinking
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Carefully read each word problem. Decide if the situation calls for the GCF or the LCM.
Clue words for GCF: biggest, largest, most, maximum, both, same, equal, divide, groups
Clue words for LCM: first, smallest, next time, minimum, both, identical, same, every___ days, every ____ hours
Mary and Nancy work at a toy factory. It is their job to inspect the toys to make sure they are working properly. If Mary inspects every twelfth toy and Nancy inspects every ninth toy, which toy will be the first that they both inspect?
a. Is this a GCF or a LCM problem?
b. What clues do you see to help you decide?
c. What is the answer to the problem?
Steve is creating lollipop bouquets using 15 red lollipops and 18 purple lollipops. He wants each bouquet to be identical, with no lollipops left over. What is the greatest number of lollipop bouquets Steve can create?
a. Is this a GCF or a LCM problem?
b. What clues did you use to help you decide?
c. What is the answer to the problem?
Written Response Question .....Think about how you would explain this to another student:
"Explain the difference between listing the factors of a number and listing the multiples of a number." You can use examples.
**Try this: Create your own word problem that requires finding a GCF or LCM. See if a friend can solve it.
Don't forget to send your responses (including a word problem, if you created one of your own) to me at:
teresa.timmins@student.dodea.edu
Fraction Sums and Differences
John works at a restaurant, and one of his jobs is to refill ketchup bottles at the end of each night. He has seven bottles to refill, and the amounts of ketchup left in each bottle are listed below:
3/9
8/9
2/9
6/9
1/9
7/9
2/9
On one particular night, the restaurant did not have more ketchup for John to refill the bottles, so he decided to consolidate them, or put them together, to make full bottles.
1. Which bottles could he put together to form full bottles?
2. How many completely full bottles would he end up with if he did this?
3. How much ketchup would be left over?
email your response to:
teresa.timmins@student.dodea.edu
Find two MIXED NUMBERS so that the SUM is 8 4/8 and the DIFFERENCE is 2 2/8.
In a box there are 20 balls: 10 white and 10 black. The balls are equal in size and shape, and they feel the same. If you are wearing a blindfold, what is the LEAST number of balls you must take from the box in order to get a pair matching in color (two white or two black)?
1.) For some lucky reason, when Haley had her party, there was no shortage of toilet paper rolls. She and her friends decided to play a game where they used toilet paper rolls to "wrap up a friend." The number of toilet paper rolls each team used are listed below:
Team A: 4 and 8/12 rolls
Team B: 6 and 1/12 rolls
Team C: 5 and 7/12 rolls
**Note: The fractions above have been corrected!
1.) How many rolls in all were used by the friends?
2.) How much more was used by Team B than Team A?
Challenge: Replace each of the mixed numbers with an improper fraction to show your work for number 2 above.
Your challenge, if you have completed all of your required assignments for your classroom teacher, and you have completed all of the Brain Teasers here on the 4th Grade AAPS Page, is to look at the Genius Hour Choice Board Activity presented below. Choose at least ONE of the activities to complete. We will share these when we return to school!