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6 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)
426 x 11
4686
426 x 10 = 4260 + 426 = 4686
1,332 x 11
14,652
10 x 1,332 = 13,320 + 1,332 = 14,652
18 x 11
198
1 + 8 = 9
put the sum between the two digits. 1~9~8
24 x 11
264
2 + 4 = 6
put the sum between the two digits. 2~6~4
99 x 11
1,089
9 + 9 = 18
put the two digit sum between the two digits.
9~18~9
then add the 1 from the sum to the left-hand 9.
9 + 1 = 10
10~8~9
37 x 11
407
37 x 10 = 370 + 37 = 407
alternative method: 3 + 7 = 10. place the 10 between the 3 and 7. 3~10~7. Add the 1 to the 3. 4~0~7