← Back to lesson·Advance A · W5 D2 · 1 drill section · ~5 min

Advance A · Week 5 · Advanced Paper-and-Mental Techniques

Day 2 Practice Worksheet — Cross-Multiplication Method (2×2)

(ab)(cd) = ac · 100 + (ad + bc) · 10 + bd.

Name
Date
Score

  1. §12-digit × 2-digit

    ⏱ 5 min · 20 problems

    Timed drill — start a 5-minute timer, then solve in order. Goal: finish under time with full accuracy.

    1. 01.67 × 26=
    2. 02.17 × 67=
    3. 03.30 × 18=
    4. 04.57 × 39=
    5. 05.65 × 72=
    6. 06.58 × 39=
    7. 07.82 × 52=
    8. 08.68 × 93=
    9. 09.66 × 38=
    10. 10.53 × 20=
    11. 11.33 × 71=
    12. 12.37 × 37=
    13. 13.25 × 62=
    14. 14.56 × 55=
    15. 15.41 × 70=
    16. 16.48 × 93=
    17. 17.49 × 56=
    18. 18.97 × 23=
    19. 19.36 × 27=
    20. 20.67 × 76=

Answer Key

§1 · 2-digit × 2-digit

  1. 1.1742
  2. 2.1139
  3. 3.540
  4. 4.2223
  5. 5.4680
  6. 6.2262
  7. 7.4264
  8. 8.6324
  9. 9.2508
  10. 10.1060
  11. 11.2343
  12. 12.1369
  13. 13.1550
  14. 14.3080
  15. 15.2870
  16. 16.4464
  17. 17.2744
  18. 18.2231
  19. 19.972
  20. 20.5092