Answer:
See attached image
Explanation:
Rounding to nearest thousand
This involves dividing by 1000 and dropping off the decimal part if less than 0.5 or rounding up to the next integer if the decimal part is 0.5 and above. Then multiply the result by 1000
For example, in the first example (a),original number is 18971.
18971/1000 = 18.971
Since the decimal part is >= 0.5 we round up 18 to 19 and then multiply by 1000 to get 19000
Rounding to nearest hundred
Divide by 100, round up to next higher integer if >=0.5 or drop the decimal part if <0.5; then multiply the result by 100
For (c): Original is 20,119
20119/100 = 201.19
Drop the decimal part since <0.5
Multiply the result 201 by 100 to get 20,100
Rounding to nearest tens
Divide by 10, drop decimal if <0.5 or round to nearest integer if >= 0.5 and multiply result by 10
For (b), original is 25687
Divide by 10 to get 2568.7
Round up to get 2569
Multiply by 10 to get 25690
Others are computed in a similar way.
Please check my computations with yours