Rounding Whole Numbers Quiz

Study Notes

A mother is buying movie tickets for herself and her son's friend. They only accept cash and each ticket costs $18.
The mother needs to withdraw money from an ATM to buy the tickets. She decides to round up the ticket price to $20 each to make the calculation easier.
A boy is asking his dad for the cost of a new game system and some games. The system costs $199, and the prices for the games are $57, $42, and $52.
The boy also rounds up the prices to make the calculation easier for his dad.
To remember how to round numbers, a baker's story is often used. In this story, the baker must turn back to his oven or go to his grandma's house based on the number in the ones column.
When rounding a number, the digit directly to the right of the place value being rounded determines whether to round up or down.
Rules for rounding include focusing on the place value being rounded and the digit to its right, keeping all digits to the left of the place value being rounded the same, and never rounding the place value being rounded.
When rounding a number like 54, the number stays the same or increases by one unless the digit is a 9 and gets rounded up.
When a 9 needs to be rounded up, the place value to its left must also round up and all other digits turn to 0.
In the example of the baker's story, the number line shows what digits round down and what digits round up.
The example also mentions that it is generally better to round up when dealing with money since it's better to have more money than less.
The text provides several examples of rounding whole numbers, including 12 tens, 368 hundreds, 504 tens, 1320 hundreds, 4553 hundreds, 7948 tens, and 7950.
The text also mentions that rounding can be written using the words "round to," "rounded by," or "rounded to the nearest." These words indicate the place value being used to round.