Question

Find the sum of 145 and 236 after rounding off them to the nearest tens.

• A. 370
• B. 380
• C. 390
• D. 400

Answer 1

The correct option is C 390

To round off a number to the nearest tens, if the units digit is greater than or equal to 5, then tens digit will be increased by 1 and units digit will be replaced by 0.

In 145, units digit is 5.
So, 145 is rounded off to 150.

In 236, units digit is 6.
So, 236 is rounded off to 240.

150 + 240 = 390

Hence, sum of 145 and 236 after rounding off them to the nearest tens is 390.