Study Notes
Place value refers to the value represented by a digit in a number based on its position. Rounding is used to approximate numbers to a required degree of accuracy.
- Place Value — the value represented by a digit in a number based on its position. Example: In 452, the 5 is in the tens place and represents 50.
- Decimal Place Value — digits to the left of the decimal point represent whole numbers, while digits to the right represent parts. Example: In 0.08, the 8 is in the hundredths place, representing eight-hundredths.
- Rounding — adjusting a number to a specified degree of accuracy. Example: 38.7 rounded to the nearest whole number is 39.
Exam Tips
Key Definitions to Remember
- Place value is the value of a digit based on its position in a number.
- Rounding is the process of approximating a number to a certain degree of accuracy.
Common Confusions
- Confusing the place value of digits in decimal numbers.
- Rounding incorrectly by not considering the digit immediately after the rounding place.
Typical Exam Questions
- What is the place value of 5 in 452? The place value is 50.
- Round 38.7 to the nearest whole number. The answer is 39.
- Round 3.168 to two decimal places. The answer is 3.17.
What Examiners Usually Test
- Understanding of place value in both whole numbers and decimals.
- Ability to round numbers correctly to different degrees of accuracy.