Students will change 3-digit numbers by mentally adding 10 (10 more) and 100 (100 more) and by subtracting 10 (10 less) and 100 (100 less). Poke a small hole in the middle of the spinner on both sides prior to the activity.
Students will spin the spinner by place the paperclip in the middle of the spinner and the pencil tip in the small poked hole. Then the student will record the number in the table under number. Students will mentally determine the number that is 10 less, 100 less, 10 more and 100 more than the number. Then they will spin again and continue.