**Adding and Subtracting**: Estimate by rounding each number to the

*highest COMMON place value.*Basically round both numbers to the biggest place value that they BOTH have.

ex:

__1__7.92 + 1

__8__2.034

since both numbers have a digit in the tens place (underlined), we would round to the tens.

20 + 180 = 200

**Multiplying:**Estimate by rounding

*EACH number to its OWN highest place value.*Basically, use as many zeros as possible!

ex: 5.67 x 41.08376

round the first number to the ones place and the second number to the tens place

6 x 40 = 240

**Dividing:**Estimate by using

*compatible numbers.*Round the

*divisor*first and then search for a compatible number for the dividend.

ex: 41.03 / 7.15

round the 7.15 to 7 and then think about multiples of 7. Since 42 is a multiple of 7 and is reasonably close to 41.03, we round it to 42.

42 / 7 = 6

Tomorrow we will have a short graded class assignment. You should know the following topics to be ready to do awesome on the graded class assignment:

- Writing decimals in word form and number form.
- example: thirty and seventy-two tenths = 30.72
- Representing a decimal value on a grid.
- Basic estimating strategies with decimals
- Round decimal values.
- Comparing and ordering decimal values.

That's it!!!

Have a good night!

-Miss K :)

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