This unit of work provides visual clues, practise sheets and speed and accuracy sheets for students to use when mastering the addition and subtraction of 9, 19, 8 and 18. The "up and down" strategy is a quick simple skill that will increase their confidence when adding these larger numbers. Excellent for students who have difficulty manipulating numbers mentally, this is a fail-safe go-to strategy that ensures results every time. Included are 8 class anchor charts, 8 student notebook charts w