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.
Comparing Decimals When comparing decimals, students must understand greater than and less than. Sometimes a number line can help. Reading Symbols < - is less than > - is greater than = - is equal to 0.5 ____ 0.7 0.5 < 0.7 0.5 is less than 0.7 Steps 1. Line up the decimals. 2. Fill in any missing digits with 0s. 3. Compare starting with the LARGEST place value on the left. Examples 1.34 _____ 10.3 Step 1: 1.34 10.3 Step 2: 0 1.34 10.3 0 Step 3: 0 1.34 1 0.30 1.34 < 10.3
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