AS: They check the reasonableness of answers using estimation and rounding.
CM: Use estimation and rounding to check the reasonableness of answers to calculations (ACMNA099)
Elaborations
CM: Use estimation and rounding to check the reasonableness of answers to calculations (ACMNA099)
Elaborations
- recognising the usefulness of estimation to check calculations
- applying mental strategies to estimate the result of calculations, such as estimating the cost of a supermarket trolley load
Find the Number (E)
- The number is a two-digit number. When in order, the answer is the middle number.
- The number is a composite number. The number's tens digit is larger than the ones digit.
- The differences between the digits is 6. Write down the answer in words.
- If you reverse the digits and find the difference between the two numbers, the answer is 54.
Fraction Find the Number:
- When converted to a decimal there is a 2 in the hundredths place.
- The fraction is less than 300%.
- The numerator is a prime number. The fraction is a positive number.
- The name of the fraction is eighths. Find the fraction
Fraction/Decimal/Percentages Find the Number:
- The digit in the tenths place is less than the digit in the hundredths place.
- The digit in the tenths place is even. The number goes to the hundredths place and is not a negative.
- The number has 7/100 in it. Double the number is greater than 7.10
- The digit in the ones place is the first odd prime number. Find the number.
Number Lines B:
- The number lies somewhere between 3 1/2 (three and a half) and 3 3/4 (three and three quarters) on the number line. Shade this section to help you.
- The number line starts at 3 and ends at 4. Label each part using decimal notation. Two digits are the same.
- The number line is calibrated into five equal parts. Draw it. The number extends into the hundredths place.
- The number is the closest to 3/75. Locate the number on the number line.
- The number is a two-digit number. When in order, the answer is the middle number.
- The number is a composite number. The number's tens digit is larger than the ones digit.
- The differences between the digits is 6. Write down the answer in words.
- If you reverse the digits and find the difference between the two numbers, the answer is 54.
Fraction Find the Number:
- When converted to a decimal there is a 2 in the hundredths place.
- The fraction is less than 300%.
- The numerator is a prime number. The fraction is a positive number.
- The name of the fraction is eighths. Find the fraction
Fraction/Decimal/Percentages Find the Number:
- The digit in the tenths place is less than the digit in the hundredths place.
- The digit in the tenths place is even. The number goes to the hundredths place and is not a negative.
- The number has 7/100 in it. Double the number is greater than 7.10
- The digit in the ones place is the first odd prime number. Find the number.
Number Lines B:
- The number lies somewhere between 3 1/2 (three and a half) and 3 3/4 (three and three quarters) on the number line. Shade this section to help you.
- The number line starts at 3 and ends at 4. Label each part using decimal notation. Two digits are the same.
- The number line is calibrated into five equal parts. Draw it. The number extends into the hundredths place.
- The number is the closest to 3/75. Locate the number on the number line.