This workbook contains 39 printable pages to help your students add and subtract two, three and four-digit problems. You will find a progression from simple to complex: from two digits to three digits to four digits; from no regrouping to regrouping; from one zero to two zeros to three zeros; from a zero in the ones place to the tens place to the hundreds place; from two numbers to three numbers to four numbers in a column. Lessons are organized from easy to hard so that you can focus on skill set each day. 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 ½ 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: Math.2.NBT.B.5 and 3.NBT.A.2 and 4.NBT.A.4
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