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