Third Grade Numbers and Operations in Base Ten Task Cards with a spooktacular theme, are just what you need this Halloween! The set of cards includes: writing numbers in standard and expanded forms, rounding to the tens and hundreds, estimating sums, addition properties, find the missing number, adding and subtracting, and words problems. These are perfect for a unit review with spooky fun clip art to keep kids engaged! Recording sheet and answer key are provided. Enjoy!