Anchor Task: Slide 1 of Powerpoint and go through the Powerpoint. Main concept: each number to 20 can be described in two ways, 1 more and 1 less than a number. For example: 12 is one more than 11 and one less than 13.
Purple and Blue table: Use number cards, select a number card and write the number in the middle; then to use a number square to find one more and one less and write the corresponding sentence.
Green and Red: to fill in differentiated worksheet.
Yellow: Finding one more and one less and challenge on the worksheet.