Mathematics
Grade5
Easy
Question
Use compatible numbers to estimate the product 34 × 42
- 1,400
- 200
- 400
- 1,500
Hint:
The estimate value are round up value of the actual value. The actual product is hard to do mentally and it takes time but when we take compatible number for estimation is easy to calculate mentally and saves time. Here 34 x 42 is hard to calculate mentally so replace both number with its compatible number and estimate the product.
The correct answer is: 1,400
Here , find the compatible number to estimate the product 34 x 42.
First , the product of these two number are:
34 x 42 =1428
It is mentally hard to find so we are going to take the compatible value of 34 and 42 .
So the for 34 replace it by 35 which is more compatible.
And,
For 42 replace it by 40 is more compatible to it.
These 35 and 40 is more compatible as well as nearest round number to it.
Now The estimated product is,
35 x 40 = 1400
So , the correct Answer is 1400 (option (b)).
Compatible numbers are those numbers which near and round number to actual number. Which helps us to find out the estimated product .These product is easy to do and you can easily done it mentally and not take enough time. You can replace actual number with these compatible numbers in similar types of question.
