Students love QR codes because are fun, they get to use technology, and they can check their own work!
This pack aligns to second & third grade common core standards:
2.NBT.7 Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method.
3.NBT.A.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
You will need a device that can scan QR codes (iPad, smart phone, etc.). You can use the cards without it, but the students will not be able to check their work.