Problem 1 :
Estimate the product :
28.3 x 3.2
Problem 2 :
Estimate the product :
34.3 x 3.5
Problem 3 :
Estimate the product :
74.8 x 5.7
Problem 4 :
Estimate the product :
328 x 42
Problem 5 :
Estimate the product :
428.5 x 57.3
Problem 6 :
Estimate the product :
5283 x 78
Problem 7 :
Estimate the product :
6523.56 x 73.569
Problem 8 :
Estimate the product :
806.67 x 68.69
Problem 1 :
Estimate the product :
28.3 x 3.2
Solution :
In the above product, the numbers can be rounded as given below.
28.3 -----> 30
3.2 -----> 3
Now, the above product will become (30 x 3).
Then,
= 3 x 3 = 9 -----> 90
So, the estimated product is 90.
Problem 2 :
Estimate the product :
34.3 x 3.5
Solution :
In the above product, the numbers can be rounded as given below.
34.3 -----> 30
3.5 -----> 4
Now, the above product will become (30 x 4).
Then,
= 3 x 4 = 12 -----> 120
So, the estimated product is 120.
Problem 3 :
Estimate the product :
74.8 x 5.7
Solution :
In the above product, the numbers can be rounded as given below.
74.8 -----> 70
5.7 -----> 6
Now, the above product will become (70 x 6).
Then,
= 7 x 6 = 42 -----> 420
So, the estimated product is 420.
Problem 4 :
Estimate the product :
328 x 42
Solution :
This is bit different case.
In the above product, the numbers can be rounded as given below.
328 -----> 300
42 -----> 40
But both the numbers are decreased. (Because 328 is close to 300 and 42 is close to 40)
Now, the estimated product ===> 300 x 40 = 12000
But the exact product is 13776.
Here, there is bit higher difference between the exact product and estimation.
So, we can round the given numbers as given below.
328 -----> 350
42 -----> 40
Now, the product will become 350 x 40
Then,
= 35 x 4 = 140 -----> 14000
So, the estimated product is 14000.
Problem 5 :
Estimate the product :
428.5 x 57.3
Solution :
In the above product, the numbers can be rounded as given below.
428.5 -----> 400
57.3 -----> 60
Now, the above product will become (400 x 60).
Then
= 4 x 6 = 24 -----> 24000
So, the estimated product is 24000.
Problem 6 :
Estimate the product :
5283 x 78
Solution :
In the above product, the numbers can be rounded as given below.
5283 -----> 5000
78 -----> 80
Now, the above product will become (5000 x 80).
Then
= 5 x 8 = 40 -----> 400,000
So, the estimated product is 400,000.
Problem 7 :
Estimate the product :
6523.56 x 73.569
Solution :
In the above product, the numbers can be rounded as given below.
6523.56 -----> 7000
73.569 -----> 70
Now, the above product will become (7000 x 70).
Then,
= 7 x 7 = 49 -----> 490,000
So, the estimated product is 490,000.
Problem 8 :
Estimate the product :
806.67 x 68.69
Solution :
In the above product, the numbers can be rounded as given below.
806.67 -----> 800
68.569 -----> 70
Now, the above product will become (800 x 70).
Then,
= 8 x 7 = 56 -----> 56,000
So, the estimated product is 56,000.
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