**Today's Lessons - Tuesday, Sept. 18:**

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In math, both groups reviewed our discussion on comparing place value using base ten.

For example:

3 **4** 5, 5 **4** 6 Compare the value of 40,000 to the value of 40.

The 4 in 40 is three places from the 4 in 40,000. The 40,000 is 10 x 10 x 10 or 10^{3} or 1000 times larger than the 4 in 40. So, 40,000 is 1000 times larger than 40. You can check your work by multiplying:

40,000 = 1000 x 40

Also: 4 x 10 x 10 x10 x 10 = 10 x 10 x 10 x (4 x 10) where there are four tens on both sides of the equality and one four.

Remember, each place in the base ten number system increases to the left by a power of 10.

We also reviewed for tomorrow’s graded classroom assignment on base ten exponents and place value:

The 10 in 10^{8} is called the base; the 8 is called the exponent.

10^{0} represents the one’s place – not a group of ten, so the exponent 0. Anything to the zero power is equal to one.

10^{1} represents the ten’s place – one zero or one group of ten expressed by the exponent one.

10^{2} represents the hundred’s place – two zeroes or 10 x 10 or the exponent two.

10^{3} represents the thousand’s place – three zeroes or 10 x 10 x 10 or the exponent three.

The pattern continues…, so one million is 10^{6} or 10 x 10 x10 x 10 x10 x 10 – in fact, the exponent six tells us that our product will have six zeroes: 1, 000, 000.

In science, students reviewed our graded assignment on sickle cell anemia. We also began a discussion on Lake Victoria – a story to help us understand how man affects our environment.

**Homework: Tuesday, Sept. 18:**

** ****Math**: *Group 1*: Comparing PV with base

ten exponents worksheet

*Group 2*: Comparing PV with base

ten exponents worksheet

**Science**: None