You will receive four sheets, 2 with subtraction problems and 2 with answers, to be copied double sided. This is a great activity for an end of day review with partners, math centers, intervention groups, or as a differentiated form of assessment. Sheets are labeled for convenience, ex. A1 & A2 go together. Teacher will time students for 1 minute and then students switch. On side 1 student will read from left to right and on side 2 partner will check answers reading from left to right. If student does not know answer then they "pass" and partner will give them the answer. This is a great mental math activity. There are 54 problems on each page.