2 Digit Addition and Subtraction Mental Math Coaching Exercise

Check out this highly engaging and competitive mental math exercise for students to build their addition and subtraction fluency! Students will practice a coaching cycle in which each of the two partners have a copy of the paper in front of them (or modified to only the coaching partner holding it) and the student will talk the other student through the 4 mental math operations. Each of the 3 squares has four components that will all be added to each other. (For example if a box has a 12, 23 14 and 20 in it the student will say add 12 and 23 then use the 45 and add 14. Now take your 59 and add 2 to the tens place. The partner without the paper is expected to be solving this in their head and write down the final sum). Throughout the coaching cycle the partner supporting the other is not supposed to give the answer but rather help their partner solve and then offer feedback as they do so. Once complete for "Round 1" the partners swap and the other student completes "Round 2".

This can be easily adapted to competitions with timers and races for who can finish first. There are three questions for each student and there are a total of 10 variations included. Each page is numbered and correlates to an attached answer key in the second half of the document. Students will develop their addition and subtraction fluency while having a blast!

2.NBT.B.5, 3.NBT.A.1, 4.NBT.B.4, 5.NBT.B.7