When rounding a number to the nearest 10, you look at the digit in the tens place. If the digit in the ones place is 5 or greater, you round up; if it is less than 5, you round down. In this case, the number 550 has a zero in the tens place and a 5 in the ones place. Since 5 is greater than 4, you round up to the next multiple of 10, which is 560.
550 to the nearest 10
10
70
Both of those numbers are already rounded to the nearest whole number.
149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000149,100,000, rounded to the nearest 10 million = 150,000,000
550
550 to the nearest 10
540
550
40
10
10
7480
400
550
The numbers 294 rounded off to the nearest 10 is 300.
150, 151, 152, 153, 154