Una tras otra.
Uno dos dos cuatro.
Uno, tres, dos, tres, seis, tres, nueve.
14 es 4, 24 es 8, 3412, 446.
15 es cinco, 2510, 3515, 4520, 5525
16 es seis, 262, 368, 4624, 5630, 6636.
17 es 7, 274, 3721, 4728, 5735, 6742, 7749.
18 es 8, 286, 3824, 4832, 5840, 6848, 7856, 8864.
Nueve novenos, 298, 3927, 4936, 59415, 6954, 79613, 8972, 9981.
Tabla de multiplicar 99:
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=21,4× 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=81