Subtraction

What number is showing?

• 37
• 27
• 47
• 100

How do you regroup a ten?

• move one ten to the ones column
• move the ones to the tens column
• change all tens to ones

    87
-   56
--------

• 21
• 54
• 76
• 31

25 - 15

• 12

• 10

• 5

Janice needs 225 blocks to build a model of a house.  She has 182 blocks.  How many more blocks does Janice need? 

• Add
• Subtract

367 - 253 = 

• 620
• 263
• 114
• 116

69 - 10 =

• 60

• 59

• 79

• 89

30 - 15 =

• 20

• 10

• 15

• 5

• 341

• 105

• 135

• 35

Do I need to regroup 45-18?

• Yes
• No