When Olympic swimmer Michael Phelps won a race by .01 of a second, we saw how significant a hundredth of a second can be! This series offers practice with decimals to build a solid understanding of the place value system.

Whether it's allowance or a dog-walking business, kids are often looking for ways to earn an extra buck. Tap into that interest with practice that includes calculating tips, sales tax and commission.

Math is part of everyday life, so learn math concepts with everyday examples. Learn to calculate sales tax, discounts, income, expenses and how to get more bang for your buck!