1
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [8, 3, 4, 3], Column headers: [9, 7, 7, 9] =
2
Speed Grid (-): Fill in each cell by applying the operation to the row and column headers. Row headers: [9, 3, 4, 9], Column headers: [7, 9, 6, 7] =