To solve 35 x 40 using mental math, we mentally can do:

• 30 x 40 + 5 x 40

• 5 x 4 + 30

• 5 x 40 x 30

• 40 x 30 - 40 x 5

To walk around his house (like a lap), Peter spends 42 seconds. If he spends 250 seconds, how many laps will he walk around his house?

• About 4

• About 5

• About 6

• About 7

In one week, Joe worked 23 h cutting grass. He was paid $9 per hour. From this money, Joe bought 5 tickets for a football game, at $15 per ticket, and 2 DVDs for $21 each. How much money did Joe have left?

• $88

• $90

• $93

• $96

Check the powers below?

 $5^3\ \ \ \ 2^4$  

CHOOSE ALL THE RIGHT OPTIONS about it:

• One of the bases is 2

• One of the exponents is 3

• One of the expanded form is 5x5x5

• One of the results is 32

Ten to the power of eight =

• 1 000 000

• 10 000 000

• 100 000 000

• 1 000 000 000

Simplify the following expression?

 $4^4-5^3\ =$  

• 143

• 131

• 137

• 129

Check this Pattern Rule.

Start at 6. Multiply by 3 each time.

The Number Pattern will be:

• 6, 18, 54, 172, 496

• 6, 24, 54, 162, 472

• 6, 18, 54, 162, 486

• 6, 16, 54, 168, 486

1, 4, 16, 64, ?

• 256

• 244

• 128

• 512

84, 72, 60, 48, ?

Choose all the correct statements for the 5th term above.

• It is an odd number

• It is equal to  $6^2$  

• It is divisible by 9

• It is a prime number

2, 6, 12, 20, 30, .... , 9th term?

• 114

• 102

• 88

• 90