Question 1

Find x.  [Just type the number]

Accepted Answer

40

Question 2

Find x.  [Just type the number]

Accepted Answer

220

Question 3

Find x.  [Just type the number]

Accepted Answer

60

Question 4

COD is a straight line. Find x.  [Just type the number]

Accepted Answer

53

Question 5

COD is a straight line. Find x.  [Just type the number]

Accepted Answer

80

Question 6

Among the 125 guests at a party, 64% are male. Find the number of female guests.

Accepted Answer

45

Answer

80

Answer

36

Answer

64

Question 7

In a box of pens, 30% of them are blue, 45% are red and the rest are black. If there are 360 red pens, find the total number of pens in the box.

Accepted Answer

800

Answer

1 440

Answer

1 200

Answer

162

Question 8

By front-end method, the expression 33.2 / 3.16 + 10.7 can be estimated as

Accepted Answer

30 / 3 + 10

Answer

33 / 3 + 11

Answer

33 / 3 + 10

Answer

30 / 3 + 11

Question 9

By choosing a suitable clustered value, the expression is most appropriately estimated as:

Accepted Answer

3 x 5

Answer

2 x 5

Answer

11 x 5

Answer

8 x 5

Question 10

Find the area of the quadrilateral ABCD in the figure.

Accepted Answer

25 cm2

Answer

20 cm2

Answer

35 cm2

Answer

50 cm2

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