Place value up to ten thousands, hundred thousands, millions (10,000s, 100,000s, and 1,000,0000s) extension challenge activities in 4th 5th Grade / Grade 4 and 5 upper elementary. Fun mental math addition and subtraction of large numbers with place value and number sense (add to and subtract from big 5, 6, and 7-digit numbers): 36 write and wipe task cards for higher numbers mental math practice for centers, stations, rotations, fast / early finishers activities, extension challenge tasks, bell