Unit 3, Activity 2, Types of Subtraction Problems



|Problems |Chan|Chan|Resu|Start Unknown: |Start Unknown: |

| |ge |ge |lt |Add to |Take from |

| |Unkn|Unkn|Unkn| | |

| |own:|own:|own:| | |

| |Add |Take|Take| | |

| |to |from|from| | |

|division | | | | | |

|divisor | | | | | |

|quotient | | | | | |

|dividend | | | | | |

|division symbols | | | | | |

|division as sharing | | | | | |

|division as repeated | | | | | |

|subtraction | | | | | |

Look at the vocabulary word. Indicate your knowledge of the word using a +, √, or –. A plus sign (+) indicates a high degree of comfort and knowledge, a check mark (√) indicates uncertainty, and a minus sign (–) indicates the word is brand new to you. Give an example and a definition/description for the term even if you have to guess.

Working with a partner, model each given number using the tiles. Put tiles into groups according to the table’s directions. Record the number of groups you were able to make.

Divide these numbers into groups of 2.

|Given Number |Groups of 2 |

|16 | |

|34 | |

|68 | |

|42 | |

|50 | |

|12 | |

Could all these numbers be divided by 2 exactly? Why or why not?

Divide these numbers into groups of 5.

|Given Number |Groups of 5 |

|35 | |

|20 | |

|45 | |

|30 | |

|15 | |

|40 | |

Could all these numbers be divided by 5 exactly? Why or why not?

Divide these numbers into groups of 10.

|Given Number |Groups of 10 |

|20 | |

|30 | |

|60 | |

|40 | |

|50 | |

|10 | |

Could all these numbers be divided by 10 exactly? Why or why not?

Divide these numbers into groups of 3.

|Given Number |Groups of 3 |

|33 | |

|27 | |

|15 | |

|18 | |

|21 | |

|12 | |

Could all these numbers be divided by 3 exactly? Why or why not?

BONUS: Can you think of a number that can be divided by 2, 5, and 10? Can you think of a number that can be divided by 2, 3, 5, and 10? (You can use your tiles.) Explain your thinking on the back of this page.

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