Math Bowl (Day 2)

Scientific Notation

100

Write 5,600,000 in scientific notation.

5.6×10⁶

200

Which is greater: 7.1×10³ or 6.9×10⁴

6.9×10⁴ (which is 69,000 vs. 7,100)

300

Write 0.000045 in scientific notation.

4.5×10^-5

400

Which of the following is the correct order from least to greatest? 

A. 3.2×10⁵, 4.1×10³, 2.9×10⁶
B. 4.1×10³, 3.2×10⁵, 2.9×10⁶
C. 2.9×10⁶, 3.2×10⁵, 4.1×10³
D. 3.2×10⁵, 2.9×10⁶, 4.1×10³

Explanation: Compare exponents: 

• 4.1×10³ → exponent 3
• 3.2×10⁵ → exponent 5
• 2.9×10⁶ → exponent 6

Answer: B

500

Arrange the following numbers in descending order:
 9.0×10^-5, 2.5×10^-2, 7.1×10^-3

2.5×10^-2, 

7.1×10^-3

9.0×10^-5

Order of Operations

100

What is 6×4÷2?

24÷2 

=12

200

What is (12÷3) × (10÷2)

 

4×5=20

300

∣3−7∣+23

4+23=27

400

2×∣5−9∣+32

40

500

Evaluate: 10−(2+3)2÷5

8

Expressions

100

Simplify the expression:

3x+4x

7x

200

Evaluate the expression when x=2x

5x−3

7

300

Write an expression for:

"Seven more than twice a number nn"

2n+7

400

Combine like terms:

2x+3+5x−1

7x+2

500

A school charges $15 per student for a field trip. The school also pays a flat fee of $100 for the bus.

Write an expression for the total cost if s students go on the trip.

Expression: 15s+100

Multiplication and Division

100

What is 6×7

42

200

What is 12x8

96

300

If 8×9=72

what is 72÷8?

9

400

A baker makes 48 cookies and packs them in boxes of 6.

How many boxes does she need?  

48÷6=8 boxes

500

A baker made 120 cookies and packed them into boxes of 10.

How many boxes did she use?

120÷10=12 boxes

Fraction to Decimals

100

Convert to Decimal

1/4

0.25

200

Convert to Decimal:

1/2

0.50

300

Convert to Decimal:

7/10

0.7

400

Convert to Decimal:

5/8

0.625

500

Convert to Decimal

2/25

0.08