Wow! I am sitting in a cyber-cafe in the mountains thinking about 25!

What is it larger than?

What is it half of?

What is half of 25?

What if it were a percent, what would it look like?

What landmark numbers is 25 close to? How close?

What's a landmark number?

If it was money, what could I buy?

Now you try.........

Peace,

T-Cubed

## Monday, June 23, 2008

## Thursday, June 12, 2008

### 25 huh? Tell me more!

A challenge follows. Please take a few minutes and jot down everything that you know about 25.

I'll be back (to be read in an Austrian accent with malice).

Peace,

T-Cubed

I'll be back (to be read in an Austrian accent with malice).

Peace,

T-Cubed

## Wednesday, June 11, 2008

### Subtraction by Addition?

Ask somebody to think of subtraction as the distance between two numbers. Then ask them to find the distance between 464 and 782 by adding up (you may want guide them into using landmark numbers...usually numbers that end in 0 or 00 or 000...). 782 - 464 becomes: 464 +

Please remember that you can start thinking this way using really small numbers to help understand. We all know that 10-4 = 6, but if you think about the distance between 4 and 10, it becomes easy to see how we can add-on to 4 until we get to 10 (4 +

Peace,

T-Cubed

**= 470 470 +***6***= 500 500 +***30**= 782 In summation, we found the distance to be***282****+***6***+***30***. Adding from left to right gives place value sums of 200 (2 is the only hundreds place value digit)+ 110 (the sum of 30 +80) + 8 (6 + 2) or 318. This may look complicated, but all can be done as simple mental math, and the concept works well with all number combinations.***282*Please remember that you can start thinking this way using really small numbers to help understand. We all know that 10-4 = 6, but if you think about the distance between 4 and 10, it becomes easy to see how we can add-on to 4 until we get to 10 (4 +

**=10)***6*Peace,

T-Cubed

### Adding and Thinking From Left to Right!

Add a number from left to right! $1,248 + $6,921 becomes 7000 + 1100 + 60 + 9 or $8169 (read as 81 hundred sixty-nine dollars) Place value-place value-place value.................................... Start with the place value that has the most value. If you make a mistake, it will likely be in a lower place value and not in a higher place value. Would you rather be off by a few bucks or a few thousand bucks?

Peace,

T-Cubed

Peace,

T-Cubed

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