Jason spent $34 on the book.

The number 34 lies in between 30 and 40.

The number 34 is closer to 30 than to 40.

So, the cost of the book $34 rounded to the nearest ten is $30.

Jeff spent $78 on a trip.

The number 78 lies in between 70 and 80.

The number 78 is closer to 80 than to 70.

So, the amount $78 rounded to the nearest ten is $80.

The number 411 is between 400 and 500.

The number 411 is closer to 400 than to 500.

So, the number 411 rounded to the nearest hundred is 400.

The amount spent by Justin and Arthur at Disney World is $232.

The number 232 is between 200 and 300. 232 is closer to 200 than to 300.

So, the amount $232 rounded to the nearest hundred is $200.

The number 454 is between 450 and 460.

The number 454 is closer to 450 than to 460.

So, the number 454 rounded to the nearest ten is 450.

The number 365 is between the numbers 300 and 400.

350 is half way between 400 and 300.

As 365 > 350, 365 is closer to 400 than to 300.

So the amount $365 rounded to the nearest hundred is $400.

Represent 147 on a number line as shown below.

147 is between 100 and 200, but closer to 100.

So, 147 rounded to the nearest hundred is 100.

The number 936 is between 930 and 940.

The number 936 is closer to 940 than to 930.

So, 936 rounded to the nearest ten is 940.

Represent 857 on a number line as below.

As 857 is closer to 860 than 850, 857 is rounded to 860.

So, 857 rounded to the nearest ten is 860.

Represent 506 on a number line as below.

506 is between 500 and 510 but is closer to 510 than 500.

So, 506 rounded to the nearest ten is 510.

Represent 94 on a number line as below.

As 94 is closer to 90 than 100, 94 is rounded to 90.

So, 94 rounded to the nearest ten is 90.

Represent 62 on a number line as below.

As 62 is closer to 60 than 70, 62 is rounded to 60.

So, 62 rounded to the nearest ten is 60.

Represent the number 2,630 on a number line.

The number of people who visited the art exhibition is 2,630.

The number 2,630 is between 2,600 and 2,700.

The number 2,630 is closer to 2,600 than to 2,700.

So, the number 2,630 rounded off to the nearest hundred is 2,600.

The number 320 is between the numbers 300 and 400.

Note the digit in the tens place of the number.

If the digit in the tens place is less than 5, round down to 300. If the digit is greater than or equal to 5, then round up to 400.

As 2 < 5, round down 320 to 300.

So, rounding 320 to the nearest hundred gives us 300.

The number 334 lies between 300 and 400.

The number 334 is closer to 300 than to 400.

So, the number 334 rounded to the nearest hundred is 300.