Mathematics 3 ESO – Unit 1 REAL NUMBERS page 11 activity 58

1 –  Complete with the word “factor/multiple”:

• a)  5 is a ___________ of 35
• b)  16 is a ___________ of 2
• c)  105 is a ___________ of 3
• d)  6 is a ___________ of 54
• e)  10 is a ___________ of 100
• f)  100 is a ___________ of 10

2 –  Watch the video on “Standard index form” and answer:

• a)  What did Archimedes calculate?
• b)  Who came up with a good way to write numbers that are really big or really small? How did he call it?
• c)  Can the number before that multiplies the power be 10? Can it be greater than 10?
• d)  When is the exponent positive? And when is it negative?
• e)  How do we find the value of the exponent in very large numbers?
• f)  How do we find the value of the exponent in very small numbers?
• g)  When doing calculations with Standard form, what rules do we use?
• h)  If when multiplying the numbers before the exponents we get a number equal or greater than 10… What do we do?
• i)  Solve:
• I)  3.2ˑ103 ˑ 6.5ˑ106
• II)  4.79ˑ10-3 ˑ 5.2ˑ10-9
• III)  1.12ˑ10-3 ˑ 4.8ˑ107