222 + 203 = 425 - estimate by rounding or using compatible numbers

You would round it to 430 because 425 is closer to 430 than 420. you would always want to round up in money to make sure you have enough.

Hi. So you would round up so that ur answer would be 430. Remember, whenever ur number ends with less than 5, it rounds down. But when it is 5 or higher, u round up. Hope that helped! :)

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction