This week we began working on multiplying and dividing whole numbers by a power of ten. Our number system is in BASE 10, which means every place value is a multiple of 10. 10 ones make 1 ten, 10 tens makes 1 hundred, 10 hundreds makes 1 one thousand...etc. As students multiply and divide by a power of ten, they begin to understand place value. For background, please watch this Khan Academy video. This video also illustrates powers of ten.
Rounding Decimals Rule: 4 or less, let it rest; 5 or more, raise the score. Steps to Rounding: 1. Identify the digit which must be rounded (place value). 2. Look at the number to the RIGHT of the digit. 3. If the digit to the right is 4 or less, the digit remains the SAME. If the digit to the right is 5 or more, the digit goes up by ONE. Examples: 4.57 rounded to the nearest TENTH. 5.19 rounded to the nearest WHOLE.
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