Add and Subtract within 1000

>And students learn dozens of interesting facts about butterflies, like: Did you know that butterflies have four wings, not two? Did you know that a male moth can smell a female from 6 1/2 miles away? Did you know that caterpillars live for just a few weeks or a month before they reach full size and are ready to transform into a butterfly? Did you know that butterflies do not grow larger? If you see a tiny butterfly, it won't get any bigger no matter how much it eats. Did you know that most butterflies live for only two to four weeks?And every page has an answer key so you don't have to make one.Common Core Standards: 2.NBT.B.5 and 3.NBT.A.2 and 4.NBT.A.4If you are interested in more addition, then take a look at these workbooks: - Addition within 1000- Addition & Place Value- First Day of School - Addition & Subtraction Games- Insect Addition- Halloween Addition & Subtraction- Addition Tic-Tac-Toe- Add & Subtract within 1000- Adding is so much fun- I can add (Addition within 1000)