Greater than or Less than Compare whole s
- Slides: 8
Greater than or Less than • Compare whole #’s first • If the same – compare the # after the decimal (tenths place) • Then move to the hundredths • If needed – add 0’s to make #’s have the same amount of digits, then compare • 1. 2201 > 1. 2100 • 7. 001 < 7. 01
Powers of 10 Rule • Multiply = move decimal to the RIGHT the same # of places as the # of zeros • EX: 6. 589 X 10 1 zero • EX: 6. 589 X 10 = 1 time • Answer: 65. 89
Powers of 10 Rule • Divide = move decimal to the LEFT the same # of places as the # of zeros • EX: 6. 589 X 1000 3 zeros • EX: 6. 589 X 1000 = 3 times • Answer: 0. 006589
Place Value Thousandths Hundredths Tenths Decimal Point Ones Tens Hundreds Thousands 2462. 851
Addition/Subtraction Decimals • Line up the decimals • Fill in spaces with 0’s • Add or subtract • Bring down the decimal 5. 94 + 2. 10 8. 04 15. 90 - 04. 15 11. 75
Multiplying Decimals • Put the # with the most digits on top • Multiply like normal • Count #’s behind decimal • Count same amount from the right in the answer and place the decimal 5. 94 2 digits behind X 2. 1 1 digit behind 12. 474 --- 3 digits from right
Dividing Decimals • Make divisor whole # by moving decimal • Do the same in the dividend • Bring decimal straight up • Divide. 2 ÷ 3. 48 2 ÷ 34. 8 ≈ 0. 057
