That is improperly formed. It could be interpreted as 490 (500 - 10)
287 + 491 + 200 + 500 + 300 + 500 + 280 + 400 + 290 + 490 = 3738
To the nearest ten, 490 To the nearest hundred, 500
$490 20*.50=$10 500-10=$490
The person might have meant 490 (literally 10 before 500), but standard notation for 490 would be CDXC
490
It is: 490+10 = 500
490
That is improperly formed. It could be interpreted as 490 (500 - 10)
500
496.
It is: 500 and not 490
490
500
To the nearest ten, 490 To the nearest hundred, 500
600 x 500 = 300000 612 x 490 = 299880
287 + 491 + 200 + 500 + 300 + 500 + 280 + 400 + 290 + 490 = 3738