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Questions and Answers
What is the main difference between multiplying decimals and whole numbers?
What is the main difference between multiplying decimals and whole numbers?
- The placement of the decimal point in the result is different (correct)
- The decimal point is ignored in the multiplication process
- Decimals cannot be multiplied
- The multiplication process is reversed
When dividing decimals by whole numbers, what is the correct step after dividing the whole number part of the decimal number by the divisor?
When dividing decimals by whole numbers, what is the correct step after dividing the whole number part of the decimal number by the divisor?
- Stop the division process
- Position the decimal point in the quotient above the decimal point in the dividend (correct)
- Bring down the tenth digit and continue with the division process
- Write the quotient as a whole number
What is the purpose of moving the decimal point in the divisor and dividend when dividing a decimal number by another decimal number?
What is the purpose of moving the decimal point in the divisor and dividend when dividing a decimal number by another decimal number?
- To convert the divisor into a whole number (correct)
- To avoid decimals in the quotient
- To make the quotient a whole number
- To make the division process easier
When multiplying decimal numbers, how many decimal places will the resulting product have?
When multiplying decimal numbers, how many decimal places will the resulting product have?
What happens when the divisor cannot divide the tenth digit of the dividend when dividing decimals by whole numbers?
What happens when the divisor cannot divide the tenth digit of the dividend when dividing decimals by whole numbers?
Why is it essential to disregard the decimal point initially when multiplying decimal numbers?
Why is it essential to disregard the decimal point initially when multiplying decimal numbers?
What is the final step when dividing decimals by whole numbers?
What is the final step when dividing decimals by whole numbers?
What is the main difference between dividing decimals by whole numbers and dividing a decimal number by another decimal number?
What is the main difference between dividing decimals by whole numbers and dividing a decimal number by another decimal number?
What is the base of the decimal number system?
What is the base of the decimal number system?
Why is the decimal number system also known as the Hindu-Arabic number system?
Why is the decimal number system also known as the Hindu-Arabic number system?
What determines the value of a certain digit in a decimal number?
What determines the value of a certain digit in a decimal number?
What is the purpose of a tier in a decimal number system?
What is the purpose of a tier in a decimal number system?
When adding decimal numbers, what should you do if a sum exceeds 9?
When adding decimal numbers, what should you do if a sum exceeds 9?
When subtracting decimal numbers, what should you do if the numbers have a different number of digits after the decimal point?
When subtracting decimal numbers, what should you do if the numbers have a different number of digits after the decimal point?
When adding decimal numbers, where should you place the decimal point in the answer?
When adding decimal numbers, where should you place the decimal point in the answer?
What is the purpose of aligning the decimal points of the numbers when adding or subtracting decimal numbers?
What is the purpose of aligning the decimal points of the numbers when adding or subtracting decimal numbers?
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Study Notes
Decimal Number System
- The decimal number system consists of 10 unique or combination of unique and asymmetric numbers from 0 to 9 with a base of 10.
- It is also known as the Hindu-Arabic or Arabic number system.
Place Value
- The place value of a digit tells us about the value of a certain digit based on its position in the number.
- It can be determined using a table or chart.
- The different groups of place values are called tiers or periods, which help us determine the place values easily.
Operations in Decimal System
Addition
- To add decimal numbers, align the numbers to be added by their rightmost digits and the decimal points.
- Add zeros to the end of the shorter number to make it the same length as the other number.
- Add the numbers starting from the rightmost digit and move leftward, carrying over the tens place to the next left column if the sum exceeds 9.
- Place the decimal point directly below the decimal points of the numbers being added.
Subtraction
- To subtract decimal numbers, align the decimal places of each subtrahend and subtractor.
- Add zeros to the shorter number to make it the same length as the other number.
- Subtract as you would with whole numbers, starting from the rightmost digit and moving left, borrowing from the next left digit if necessary.
- Place the decimal point in the answer directly beneath the other decimal points.
Multiplication
- The process of multiplying decimals is similar to multiplying whole numbers, with the only difference being the placement of the decimal point in the result.
- Multiply the two numbers as usual, disregarding the decimal point.
- Determine the number of decimal places in the decimal number and place the decimal point in the product accordingly.
Division
Dividing Decimals by Whole Numbers
- Divide the whole number part of the decimal number by the divisor.
- Position the decimal point in the quotient above the decimal point in the dividend.
- Bring down the tenth digit and continue with the division process.
- Add zeros to the dividend until the remainder is zero.
Dividing a Decimal Number by Another Decimal Number
- Convert the divisor into a whole number by moving the decimal point to the right.
- Move the decimal point in the dividend to the right by the same number of places.
- Divide the resulting numbers as usual.
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