1
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [5, 1, 2, 1], Column headers: [3, 6, 4, 5] =
2
Speed Grid (×): Fill in each cell by applying the operation to the row and column headers. Row headers: [8, 6, 10, 1], Column headers: [6, 9, 9, 8] =