For example, in 478{\displaystyle 478}, the “talking digit” in the tens place is a 7{\displaystyle 7}. Using a number line can help you easily visualize which hundred your number is closest to.
For example, in 478{\displaystyle 478}, the tens digit is a 7{\displaystyle 7}, so you’d round up to 500{\displaystyle 500}.
For example, as you saw with 478{\displaystyle 478}, the 7{\displaystyle 7} in the tens place means you need to round up, so you’d add 1{\displaystyle 1} to 400{\displaystyle 400} to get 500{\displaystyle 500}. If you round down, the hundreds digit stays the same. For example, 423{\displaystyle 423} gets rounded down to 400{\displaystyle 400} because the digit in the tens place is 2{\displaystyle 2}.
Power sunroof: $725 Rear spoiler: $250
Remember that you’re rounding to the nearest hundred. With 147{\displaystyle 147}, it would be incorrect to first round the 4{\displaystyle 4} up to 5{\displaystyle 5} because of the 7{\displaystyle 7} in the ones place, and then round up to 200{\displaystyle 200}. [10] X Research source
Round the cost of each of the two options. The power sunroof is $725, which rounds to $700. The rear spoiler is $250, which rounds to $300. Add your rounded numbers together and you get $1,000. Since you’ve already established that your mom has an extra $2,000, and $1,000 is less, you can conclude that she can afford the two options she wants.
