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

Day 4 Practice Worksheet — Close-Together Method

When both factors sit near the same round number.

Name
Date
Score

  1. §1Close-together pairs

    ⏱ 5 min · 20 problems

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

    1. 01.55 × 72=
    2. 02.45 × 99=
    3. 03.11 × 41=
    4. 04.85 × 26=
    5. 05.93 × 14=
    6. 06.51 × 38=
    7. 07.94 × 61=
    8. 08.82 × 84=
    9. 09.93 × 87=
    10. 10.52 × 87=
    11. 11.37 × 68=
    12. 12.74 × 88=
    13. 13.42 × 12=
    14. 14.51 × 59=
    15. 15.44 × 81=
    16. 16.11 × 37=
    17. 17.57 × 18=
    18. 18.66 × 33=
    19. 19.34 × 63=
    20. 20.98 × 47=

Answer Key

§1 · Close-together pairs

  1. 1.3960
  2. 2.4455
  3. 3.451
  4. 4.2210
  5. 5.1302
  6. 6.1938
  7. 7.5734
  8. 8.6888
  9. 9.8091
  10. 10.4524
  11. 11.2516
  12. 12.6512
  13. 13.504
  14. 14.3009
  15. 15.3564
  16. 16.407
  17. 17.1026
  18. 18.2178
  19. 19.2142
  20. 20.4606