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Estimaciones
Potencias de Diez
Parenthesis
Conversiones
100

4 x 29=

4 x 30= 120

100

43 x 10=

430

100

(9 + 1) x 2=

10 x 2 = 20

100

1 metro = ___ centímetros

100 centímetros

200
9.1 x 78=

9 x 80= 720

200

9.8 ÷ 10=

0.98

200

(12 -5) x 10=

70

200

2 yardas = ___ pies

1 yarda = 3 pies

2 yardas = 6 pies

300

81 x 45 =

80 x 50= 4000

300

0.87 x 100=

87

300

8 por la suma de 7 y 2

(7+2) x 8 = 9 x 8 = 72

300

0.5 metros = ___ centímetros

1 metro = 100 centímetros

0.5 metros = 50 centímetros

400

85 x 320=

90 x 300= 27,000

400

0.59 x 0.1=

x 0.1 = ÷10

0.059

400

La mitad de la suma de 3 y 5

(3 + 5) ÷ 2 = 

8 ÷ 2 = 4

400

25 pulgadas (inches) = ___ pies (feet)

12 inches = 1 ft

25 inches ÷ 12 = 2 remainder 1

25 inches = 2 feet 1 inch

500

1.8 x 25.5 x 9.7 =

2 x 30 x 10 =

20 x 30 = 600

500

8.59 ÷ 102 =

8.59 ÷ 100 = 0.0859


500

La suma de 2 cincos y 4 sietes

(2 x 5) + (4 x 7) =

10 + 28 = 38

500

45 gramos = ___ kg

g to kg --> ÷ 1,000


45 ÷ 1,000 = 0.045