Round 48 to the nearest ten.

Hint

Sacramento is 116 miles from San Jose. About how many miles is Sacramento from San Jose? Round to the nearest ten.

120

200

100

125

Hint

Which river is the longest?

River Length (miles)
Mississippi 3,716
Nile 2,578
Volga 2,762
Yang-tze Kiang 3,314

Source: infoplease.com

Mississippi

Volga

Yang-tze Kiang

Nile

Hint

Round 982 to the tens place.

980

900

800

1,000

Hint

Round 63,820 to the thousands place.

63,000

60,000

63,800

64,000

Hint

Round 532,940 to the ten thousands place.

532,900

533,000

530,000

500,000

Hint

Find 9 + 2 + 1.

Hint

Find the next number in the pattern.

21, 18, 15, 12, 9

Hint

Solve p + 8 = 19 mentally.

p = 11

p = 27

p = 7

p = 9

Hint

10.

Solve n - 15 = 15 mentally.

n = 45

n = 30

n = 0

n = 15

Hint

11.

Write an equation that describes the pattern.

Input (a) 7 10 13 16 19 22
Output (b) 9 12 15

a + b = 2

a + 3 = b

a + 2 = b

a − 2 = b

Hint

12.

Find the missing number in the equation.

__ + 10 = 10 + 15

Hint

13.

Imelda�s vacation webpage received 84 hits over the weekend. On Saturday, she recorded 37 hits. How many hits were there on Sunday?

121

Hint

14.

Find the number that completes the number sentence. Then identify the property or rule.

12 − __ = 12

0; Associative Property of Addition

12; Commutative Property of Addition

0; Subtraction Rule

0; Identity Property of Addition

Hint

15.

Add mentally.

13 + 21 + 17

Hint

16.

Estimate. Round to the indicated place value.

579 − 412; hundreds

500 − 500 = 0

600 − 400 = 200

580 − 420 = 160

500 − 400 = 100

Hint

17.

Solve.

$96.13

$106.33

$95.33

$96.33

Hint

18.

Find 872 − 678.

294

206

194

106

Hint

19.

Subtract.

2,858

1,858

2,962

2,142

Hint

20.

Subtract.

$15.53

$15.63

$14.47

$26.47

Hint