Multiplication Problems in Stories
Watch a video about multiplication problems!
Goal:
Goal:
Learn!
Goal: “Learn about writing story problems.”
TEACHER: We had such a fun time playing games in class today! Can you help me clean up the games?
STUDENT: Yes! How many things do we need to put away?
TEACHER: We will multiply to find out! Let’s start with these groups of dice.
STUDENT: Hmm, groups of dice. That sounds like a multiplication problem!
TEACHER: It is! I’ll write it on the board.
STUDENT: Where are the numbers?
TEACHER: We will use the dice to create an array to find the numbers. Let’s draw a picture that shows the dice in 2 groups. How many are in each group?
STUDENT: I see 4 dice in each group. That’s 2 groups with 4 in each group!
TEACHER: Great job! What array can we use to show 2 groups with 4 in each group?
STUDENT: 2 groups means 2 rows. 4 in each group means 4 dots in each row.
TEACHER: Excellent! A 2 by 4 array. Now we can find the numbers. What are the important numbers for this problem?
STUDENT: 2 and 4! 2 is the first number because it is the number of groups. 4 is the second number because it is the number in each group.
TEACHER: You’ve got it! Our sentences are 4 plus 4 and 2 times 4. Let’s find the total number of dice. We can use the picture, the array, or the repeated addition sentence. Which one would you like to use?
STUDENT: I would like to use the picture. I see 2 groups of 4. 4 and 4 make 8. There are 8 dice!
TEACHER: That’s right! 8 is the total number. We can put the dice away. Now let’s multiply to find the total number of game pieces. First, we will need a multiplication picture. The game pieces are in 5 rows. How many are in each row?
STUDENT: There are 3 game pieces in each row! That means we need 5 circles with 3 game pieces in each circle.
TEACHER: Yes! Now we need an array. What array shows 5 groups with 3 in each group?
STUDENT: A 5 by 3 array. 5 and 3 must be the important numbers!
TEACHER: Excellent! We have 5 groups of 3. Our sentences are 3 plus 3 plus 3 plus 3 plus 3 and 5 times 3. We can use the picture, the array, or the repeated addition sentence to solve. What would you like to use?
STUDENT: I want to try using the array. 3 plus 3 is 6. 6 plus 3 is 9. 9 plus 3 is 12. 12 plus 3 is 15. There are 15 game pieces!
TEACHER: You’ve got it! 15 is the total number. We can put the game pieces away. Now let’s multiply to find the total number of cards. Can you draw a picture and an array that show the cards in 8 rows of 2?
STUDENT: Wow! That’s a lot of cards. 8 rows of 2 means 8 circles with 2 cards in each circle. That also makes an 8 by 2 array! The important numbers must be 8 and 2!
TEACHER: Fantastic! Our sentences are 2 plus 2 plus 2 plus 2 plus 2 plus 2 plus 2 plus 2 and 8 times 2. We can use the picture, the array, or the repeated addition sentence to solve. What would you like to use?
STUDENT: I want to try the repeated addition sentence. Wait, the repeated addend is a 2. Can I skip count by 2s to find the total number?
TEACHER: Yes, you can! Let’s skip count together. Ready?
S and TEACHER: 2, 4, 6, 8, 10, 12, 14, 16.
STUDENT: There are 16 cards!
TEACHER: Yes! 16 is the total number. We can put the cards away. Thank you for your help multiplying and cleaning up the games!
STUDENT: That was fun! Using multiplication pictures and arrays really helped me write and solve multiplication story problems!
Look at the multiplication picture and array. What are the important numbers?
Sorry, that is not right. 7 and 2 are the important numbers.
That is right! 7 and 2 are the important numbers.
Sorry, that is not right. 7 and 2 are the important numbers.
You got # out of # correct.
Click the Retry button for another attempt.
You got a perfect score. Great job!