Set of 32 Place Value Task Cards that ask students to mentally add or subtract 10, 20 or 30 to a given two-digit number. Encourages mental math and place value understanding. Two complete versions- one without qr codes and one with qr codes for students to check their own work. Both versions include a recording sheet.
Differentiation Ideas: All odd numbers are "less than" problems and all even numbers are "more than" problems. Students can practice one skill or the other by having them do only odds or only evens.