1
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [9, 8, 4, 6], Column headers: [1, 2, 8, 6] =
2
Speed Grid (×): Fill in each cell by applying the operation to the row and column headers. Row headers: [6, 5, 7, 7], Column headers: [4, 7, 3, 5] =