Ways to Make a Number to 100
π¨ Be a math artist! There isn't just one way to paint a number. There are infinite ways! How many ways can you create the number 50?
Do this: Read the concept below, then try the quiz or activity.
Concept
If I ask you to "Make the number 10", you know lots of ways! (5 + 5), (8 + 2), (12 - 2), (20 - 10). We can do the same thing with giant numbers!
π― The Number Factory: Let's see how many ways we can manufacture the number 75. 1. The Easy Way (Zero): 75 + 0, or 75 - 0. 2. The Plus-One/Minus-One Way: 74 + 1, or 76 - 1. 3. The Tens Way: 65 + 10, or 85 - 10. 4. The Split Way: 50 + 25. 5. The Crazy Way: 100 - 25!
They all equal exactly 75!
Try it
Run the Number Factory!
Instructions: Write two addition facts and two subtraction facts that equal the target number!
Target Number: 60
Addition Factory (Ways to add to 60): 1. ___ + ___ = 60 (Try 30 + 30!) 2. ___ + ___ = 60 (Try 50 + 10!) 3. ___ + ___ = 60 (Make up your own!)
Subtraction Factory (Ways to subtract to 60): 4. ___ - ___ = 60 (Try 70 - 10!) 5. ___ - ___ = 60 (Try 100 - 40!) 6. ___ - ___ = 60 (Make up your own!)