Simply Express Yourself!
(3 + 6) × 3
27
Are all trailing zeros significant?
Only if there is a decimal in the number.
(negative) + (negative) = __________________
Negative
What is an irrational number?
An irrational number is a number which cannot be written as a quotient of two integers such as m/n
It is a non-terminating and non-repeating decimal.
The lowest temperature ever recorded in Greenland was -87°F in 1954. The lowest temperature ever recorded on Earth was in 1982 at Vostok Station, Antarctica and was -41.6°F lower than Greenland’s record low. What is the record low temperature on Earth?
-128.6°F
(10 + 2 − 2) × 6 − 1
59
True or False: All Non zero numbers are significant.
True
When subtracting integers you "KCC".
Give an example and explain the steps of this memory tool KCC.
Keep Change Change (KCC)
KEEP- Keep the sign of the first number
CHANGE- Change the subtraction sign to addition
CHANGE- Change the sign of the second number to the opposite sign. If it is positive- change to negative. If it is negative- change to positive.
(+4) – (-4)
Keep change change
(+4) + (+4)
Is the square root of 24 an irrational number? Explain.
Yes!
24 is not a perfect square, so 24 cannot be expressed as a quotient of two integers.
24 = 4.898979485566..., which is a non-terminating and non-repeating decimal.
A submarine descends at a speed of 138.7 feet per minute. What is its depth relative to the surface of the water, after 5 minutes?
-693.5 ft
(−2 − −3) × 6 − 1 − (−4 − −4)
5
How many significant digits in 32020900
6
When you divide and multiply and ODD number of negative numbers your answer will always be _________
Negative
Plot the square root of 105 on a number line.
What two numbers (rounded to the nearest tenth) would it be between.
Example: The square root of 24 is approximately 24.89. Plot between 24.8 and 24.9. It would be closer to 24.9
The square root of 105 is approximately 10.246
Plot between 10.2 and 10.3.
It is slightly closer to 10.2. It is very close to the middle when you round 10.246 to 10.25.
Given a triangle with area 150.08 square centimeters and base 26 centimeters, find the height of the triangle, correct to 2 significant digits. Do not forget to Label!
Area= 1/2 x Base x Height
12 cm
(−2 − 3) ÷ −5 − (12 × 2) ÷ −4
7
Round 62.5347 to four significant figures
62.53
When you add two numbers with different signs you (explain the steps)
-4 +5 =
4 + -5 =
Subtract the absolute value of the numbers and keep the sign of the bigger number.
20.455566...
This is an ______________. I know this because
There are no repeating or terminating numbers. The "..." represents numbers going on foreverrrrr.
At 2 A.M., the temperature was -4°C.
At 4 A.M., the temperature was 5˚C colder.
What was the temperature at 4 A.M.?
-9°C
23 - 6 ⋅ 2 + 3
-1
How many significant digits? 0.0000003040
4
Which of the following are integers:
-1.5
-2
0
1/3
3/0
0/3
5
22/7 is is an approximation for _______. It is a __________ number.
pi , irrational number
Elsie had four packages. The weight of the first package was 3.8 pounds. The second package was 1.2 pounds more than twice the weight of the first package. The third package weighed 2.1 pounds less than the first package. And the fourth package weighed 3.6 pounds less than the second package.
Find the total weight of the four packages.
19.5 lb