1
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [9, 5, 9, 4], Column headers: [6, 4, 6, 3] =
2
Speed Grid (-): Fill in each cell by applying the operation to the row and column headers. Row headers: [2, 2, 9, 9], Column headers: [2, 6, 5, 2] =