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I am trying to help my 3rd grader to complete the tables to find how many ways each can be solved. Here’s one. Please help!

John has 42 model cars. He wants to put 3 cars on some shelves and 2 cars on other shelves. How many ways can he display his model cars?

Shelves with 3 cars:
Shelves with 2 cars:
Total cars:

How do I solve this?

Respuesta :

lotuselyse05

Shelves with 3 cars: 10

Shelves with 2 cars: 6

Total:42

Shelves with 3 cars: 6

Shelves with 2 cars: 12

Total:42

There are many ways to do this. So what I did was multiply 3 by a number like 10. Then I took the 2 and multiplied it  by 3. i added the numbers 30+6=36. that doesn't work so i tried 2 multiplied by 6. 30+12=42. Hope this helped a little. :D