Math ReviewUnit 1

Tool Check

Vocabulary

Round- to change a number to the nearest place value

Friendly numbers- are easy to multiply and divide. They are multiples of 5, 10, 25, 50 or 100

estimation:0An estimate is an educated guess.

0Round the nearest place value or make numbers friendly (multiples of 5,10, 25, 50, 100)

0Then solve to see if your estimate is close to the exact answer

Rounding RulesFind your place value, underline the digit

Move to the right, circle it-get it?

0-4 the number stays the same5-9 add one to the game

Now flex your muscles like a hero,Numbers to the right turn to zero

All the other numbers stay the sameYo! Now you're a winner in the rounding

game!

Practice:

15879

8576

684389

394439

58943

7489

5623

126554

Vocabulary Sum- answer to an addition problem.

Difference- answer to a subtraction problem.

Practice: 43 + 32 + 44 + 35 =

76,999 − 68,205 =

56,880 + 43,375 =

Practice: British astronomer William Herschel discovered the planet Uranus in 1781. In the year 2015, how long will it have been, rounded to the nearest hundred, since Uranus was discovered?

Satellite orbits vary in their distance from the earth. Orbits can be anywhere from 252,800 to 35,200,000 yards. What is the greatest distance between satellite orbits? Round to the nearest ten thousand to estimate.

Vocabulary

Product- answer to a multiplication problem

Quotient- answer to a division problem.

Practice: 586 X 98 =

 

 5011 X 97 =  

68,588 / 990 =  

   53,838 / 997 =

Practice: There were 7,667,066 passenger vehicles sold in the United States in one year. If the same number of vehicles were sold for each of the next 8 years, how many were sold? Estimate then solve. Explain why your estimate was reasonable.

Vocabulary0 Expression- one or more numbers and symbols that show a certain

value (Whole problem) 0 Base- the number repeatedly multiplied when the number has an

exponent (bottom number)

0 Exponent- the number of times a base number is multiplied by itself (top number)

 0 Squared- the result of the operation where a number has been

multiplied by itself (2nd Power)

0 cubed - the result of the operation where a number has been multiplied by itself two times (3rd power)

0 factor - one of two or more numbers that are multiplied

Practice:

23 64

Practice: Expression Equal Factors Standard Form

52

25

33

44

73

0factor - one of two or more numbers that are multiplied

0prime factorization - an expression showing a whole number as a product of its prime factors

3X3X5 0composite number 0a whole number greater than 1 that is not prime 0Prime number- any number who only has 2

factors (itself and one)

Vocabulary

72 96 12

Practice:

18 64 21

Practice: