Question

Estimate the difference by rounding off the numbers to nearest tens before subtraction.
89,348 – 8,366

Write the expanded form of the estimated difference.

Answer 1

By rounding off to nearest tens, the estimate of their difference can be calculated as:

89,348 can be rounded off to 89,350.
8,366 can be rounded off to 8,370.
Hence, the estimated difference = 89,350 - 8,370 = 80,980.

We observe that,
0 is at one's place
8 is at ten's place
9 is at hundred's place
0 is at thousand's place
8 is at ten thousand's place

$\therefore \text{The expanded form of}80980$ is:
$8\times 10000+0\times 1000+9\times 100+8\times 10+0\times 1$.