Math: First Eight Digits of Pi Practice
Memorize, identify, and use 3.1415926
Math: First Eight Digits of Pi Practice
Memorize, identify, and use 3.1415926
Math - Grade 6-8
- 1
Write the first eight digits of pi, including the decimal point.
Start with 3, then write seven digits after the decimal point.
The first eight digits of pi are 3.1415926. - 2
In the number 3.1415926, what digit is in the hundredths place?
The digit in the hundredths place is 4 because it is the second digit to the right of the decimal point. - 3
Fill in the missing digits: 3.14__926
Compare the pattern to the first eight digits of pi.
The missing digits are 15, so the completed number is 3.1415926. - 4
Round 3.1415926 to the nearest hundredth.
3.1415926 rounded to the nearest hundredth is 3.14 because the thousandths digit is 1, so the hundredths digit stays the same. - 5
Round 3.1415926 to the nearest ten-thousandth.
The ten-thousandths place is the fourth digit after the decimal point.
3.1415926 rounded to the nearest ten-thousandth is 3.1416 because the hundred-thousandths digit is 9, so the ten-thousandths digit rounds up. - 6
Which number is greater: 3.1415926 or 3.1415296? Explain how you know.
3.1415926 is greater because the digits match until the fifth digit after the decimal point, where 9 is greater than 2. - 7
A student writes pi as 3.1419526. Identify the first digit that is incorrect when compared with 3.1415926.
Compare the digits from left to right.
The first incorrect digit is 9 in the ten-thousandths place. It should be 5 in 3.1415926. - 8
Place 3.1415926 on a number line between 3.14 and 3.15. Is it closer to 3.14 or 3.15?
3.1415926 is closer to 3.14 because it is 0.0015926 above 3.14 and 0.0084074 below 3.15. - 9
Use pi = 3.1415926 to estimate the circumference of a circle with diameter 10 centimeters. Use C = pi times d.
Multiplying by 10 moves the decimal point one place to the right.
The circumference is 31.415926 centimeters because 3.1415926 times 10 equals 31.415926. - 10
Use pi = 3.1415926 to estimate the circumference of a circle with diameter 4 meters. Use C = pi times d.
The circumference is 12.5663704 meters because 3.1415926 times 4 equals 12.5663704. - 11
Write 3.1415926 rounded to the nearest whole number. Explain your reasoning.
Look at the digit immediately to the right of the ones place.
3.1415926 rounded to the nearest whole number is 3 because the tenths digit is 1, which is less than 5. - 12
Create a memory phrase using words with letter counts that match the digits 3, 1, 4, 1, 5, 9, 2, 6. Write your phrase and check that the word lengths match 3.1415926.
For example, the first word should have 3 letters, the second word should have 1 letter, and the third word should have 4 letters.
One possible phrase is 'Pie I love a tasty wonderful pi number.' The word lengths are 3, 1, 4, 1, 5, 9, 2, and 6, matching 3.1415926.