1
Speed Grid (-): Fill in each cell by applying the operation to the row and column headers. Row headers: [6, 10, 1, 9], Column headers: [6, 10, 3, 7] =
2
Speed Grid (+): Fill in each cell by applying the operation to the row and column headers. Row headers: [8, 5, 10, 9], Column headers: [1, 1, 3, 4] =