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3 years ago

11

How can you use doubles when multiplying with 4 to find 4x8

1 answer:

pshichka [43]3 years ago

4 0

4 = 2 * 2

Multiplying by 2 is the same a doubling.
Since 4 is 2 * 2, to multiply a number by 4, double the number twice.

Example:
What is 4 * 100?
Double 100 to get 200.
Double 200 to get 400.
Therefore, 4 * 100 = 400.
By doubling twice, we do the same as multiplying by 4.

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The volume of a cone-shaped dessert is 10 CUBIC CENTIMETRES.

allochka39001 [22]

Answer:

3. 2.4 c.m

The height of the cone 'h' = 2.4 c.m

Step-by-step explanation:

<u><em>Explanation</em></u>:-

<em>Given radius of the cone = 2 cm</em>

Given data

The volume of a cone-shaped dessert is 10 cubic centimetres

<em>The Volume of the Cone </em>

<em> </em> $V = \frac{1}{3} \pi r^{2}h$ <em></em>

$10 = \frac{1}{3} X 3.14 X (2)^{2} X h$

cross multiplication , we get

$h = \frac{ 3 X 10}{3.14 X 4}$

h = 2.388 ≅ 2.4 c.m

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3 years ago

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Step-by-step explanation:

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3 years ago

There are 100 people in a sport centre.

Arlecino [84]

We need to determinate who doesn't use anything, so first we must know the real number of who are practising: a person can do more things.

For doing this, is better use a three-circles graphic, but we try to do without it.

So

16 pool + gym + track, and this number is sure

38 gym + pool, but this number includes the people of 1st point. We must know who do only gym + pool: 38 - 16 = 22

31 pool + track, this number also includes people of 1st point, so: only pool + track 31 - 16 = 15

33 gym + track, this number also includes people of 1st point, so: only gym + track 33 - 16 = 17

now:

67 gym, we must know who use only gym: 67 - 16 (gym + pool + track) - 22 (gym + pool) - 17 (gym + track) = 12

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now we must now who do some facility: let's sum all

16 + 22 + 15 + 17 + 12 + 9 + 8 = 99

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