21st Century Math Review

PEMDAS

100

Which part of this equation would you complete first?

7x3+90(1,433-78)+32

1,433-78

200

Solve.

19-5+3(12x4)-18

140

300

Dontae completes the following equation. His answer is 134. Is he correct?

5(100+1)-332+28

He is not correct. The correct answer is 197.

400

Ezekiel completes the following equation. His answer is 477. Is he correct?

15-5+2(6x4)-3

He is correct.

500

What do each of the letters in PEMDAS stand for?

Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction

Rounding

100

Round 377 to the nearest ten.

380

200

Round 2,083 to the nearest hundred. 

2,100

300

Arianna rounds 8,374 to the nearest thousand. Her answer is 7,000. Is she correct? Why or why not?

She is not. If the number beside the place value you are rounding to is less than 5, the number you round to stays the same. Numbers are NEVER rounded down.

400

What are the steps to rounding?

First: Identify the place value

Second: Look at the number to the right of the number being rounded. If it is less than 5, the number stays the same. If it is 5 or above, the number is raised by one.

Third: All numbers to the right of the number being rounded becomes a zero.

500

Round 238,997 to the nearest ten thousand.

240,000

Subtraction

100

Solve.

733-319

414

200

Solve.

8,730-5,937

2,793

300

Braylen subtracts 677-390. His answer is 287. Is he correct?

He is correct.

400

Bobby subtracts 6,206-4,948. His answer is 1,259. Is he correct?

He is not correct. The answer is 1,258.

500

Solve. 

9,003-5,284

3,719

Multiplication

100

Solve.

11x7

77

200

Solve. 

9x6

54

300

What are the steps to solving a problem with multiple digits? (Example: 12x36)

First: multiply the ones place in the bottom number by each place value in the top number

Second: Place a 0 in the ones place below the first answer

Third: Multiply the tens place in the bottom number by each place value in the top number

Fourth: Add the two answers together

400

Dunmarion is multiplying 22x7. His answer is 154. How can he check to make sure his answer is correct?

He can divide 154 by 22 or 7. 

500

Solve.

134x25

3,350

Fractions

100

Are the fractions 2/3 and 18/27 equivalent?

Yes. They are equivalent.

200

Are the fractions 5/6 and 30/42 equivalent?

No. They are not equivalent.

300

Convert 9/5 to a mixed number.

1 4/5

400

Mia converts the mixed number 2 2/3 to an improper fraction. Her answer is 4/3. Is she correct?

She is not correct. The improper fraction would be 8/3.

500

Solve.

2/3 x 5/11

10/33