MATH YEAR 8

When is a number written in standard form?

• when a number between 1 and 9.9 is multiplied by a power of 10.

• when a number between 1 and 10 is multiplied by a power of 10.

• when it only multiplies by 10

• when it is only multiplied by 100

How do you write this number 650,000,000 in standard form?

• 6.5 ✕ 10⁷

• 6.5 x 10⁹

• 6.5 ✕ 10¹⁰

• 6.5 ✕ 10⁸

What’s the shortest way?

• 200 hm

• 500 dam

• 3 km

• 600 hm

Express 0.000056 in standard form

• 5,6 x 10^-5

• 56 x 10^-5

• 5,6 x 10^-4

• 5,6 x 10⁵

5.68 x 10⁸ =?

• 568 000 000

• 568 00000

• 5 680 000 000

• 0,0000568

Planet Earth is 150 million kilometers from the sun. This number in standard form is ...

• 1,5 × 10⁸ km

• 0,15 × 10¹⁰ km

• 1,5 × 10^-10 km

• 0,15 × 10⁹ km

The mass of an electron is approximately 0,000 000 000 000 000 000 000 000 910 938 22 kg. In standard form and rounded to three significant figures is written:

• 9,10 × 10^-31 kg

• 9,11 × 10³¹ kg

• 9,11 × 10^-31 kg

• 9,109 × 10^-31 kg

The size of a red globle is about 7,5×10⁻⁷ mm. Which of the following numbers equals?

• 0,000 000 75

• 0,000 000 007 5

• 75000000

• 75000000000

0.00000005 in standar form is = ?

• 5x10^-7 mm
• 5x10⁸ mm
• 5x10⁷ mm
• 5x10^-8 mm

When multiplying a number by a power of 10, the decimal point moves...

• To the left if the exponent is positive and to the right if the exponent is negative.

• To the right if the exponent is positive and to the left if the exponent is negative.