One by one.

One, two, two, four

One, three, two, three, six, three, nine.

14 has 4,24 and 8,3412,446.

15 is five, 25 10, 3515,4520,5525.

16 is 6,262,368,4624,5630,6636.

17 is 7,274,3721,4728,5735,6742,7749.

18 has 8,286,3824,4832,5840,6848,7856,8864.

Nine-tenths, 298,3927,4936,59415,6954,79613,8972,9981.

99 multiplication table:

1× 1= 1

1×2=2,2×2=4

1×3=3,2×3=6,3×3=9

1×4=4,2×4=8,3×4= 12,4×4= 16

1×5=5,2×5= 10,3×5= 15,4×5=20,5×5=25

1×6=6,2×6= 12,3×6= 18,4×6=24,5×6=30,6×6=36

1×7=7,2×7= 14,3×7=2 1,4×7=28,5×7=35,6×7=42,7×7=49

1×8=8,2×8= 16,3×8=24,4×8=32,5×8=40,6×8=48,7×8=56,8×8=64

1×9=9,2×9= 18,3×9=27,4×9=36,5×9=45,6×9=54,7×9=63,8×9=72,9×9=8 1