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