Time to add and subtract! Practice counting up to add or counting down to subtract. Learn how to use number bonds to help with both. And if you spot a double fact, like 5 + 5, use it to solve the problem faster! You're almost done. Just finish four more word problems to wrap up the challenge.

Let's explore addition and subtraction! Number bonds help you see how numbers fit together. For example, in 13 + 5, break 13 into 10 and 3. First, add the ones (3 + 5), then add the 10 to get 18. Here's another one: in 18 - 6, break 18 into 10 and 8. Subtract the ones (8 - 6), then add the 10 to get 12. A number bond turns a big number into two smaller ones. Once they are in bite-size pieces, adding and subtracting gets easier. Try it! As you work through the problems, keep an eye out for double facts. That is when the same number is added twice, like 5 + 5. Double facts are like shortcuts. They help you solve problems faster. Ready for the challenge? Grab your pencil, and let's go!