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3 years ago

Joe says 4.02 x 0.3 is bout 12. Does this make sense? Explain your thinking

2 answers:

7 0

Think: 4.02 is about 4 and 0.3 is about 1/3. 4 times 1/3 is 4/3, or about 1.33. So 12 is 'way off. It's always wise to estimate what your answer should look like.

svlad2 [7]3 years ago

4 0

This does not make sense as you are multiplying 4.02 by a number less that 1, so the product will become smaller. By actual calculation, this will be 1.206. Hope this helps.

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A chemical balance needs to weigh 237g using weights of 50g, 20g, 10g and 1g. How many of each weight is needed?

Delicious77 [7]

The required number of weights used in chemical balance to weigh 237g is 4,1,1,7 respectively.

What is mathematical expression?

A mathematical expression expression in mathematical is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Here, it is given that :

A chemical balance needs to weigh 237g using weights of 50g, 20g, 10g and 1g.

Now, let us find the number of weights for each weight type :

For 50g weight the maximum number of weights needed will be 4 that is :

50g x 4 = 200g

Now, for 20g weight the maximum number of weights needed will be 1 that is :

20g x 1 = 20g

Now, for 10g weight the maximum number of weights needed will be 1 that is :

10g x 1 = 10g

Now, for 1g weight the maximum number of weights needed will be 7 that is :

1g x 7 = 7g

Adding all the weights we get :

200g + 20g + 10g + 7g = 237g;

which is the required weight and the number of weights used is 4,1,1,7 respectively.