← Back to lesson·Advance A · W5 D4 · 1 drill section · ~5 min

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. 01.54 × 30=
    2. 02.31 × 68=
    3. 03.91 × 29=
    4. 04.27 × 82=
    5. 05.53 × 73=
    6. 06.50 × 32=
    7. 07.28 × 48=
    8. 08.43 × 11=
    9. 09.41 × 54=
    10. 10.59 × 91=
    11. 11.27 × 45=
    12. 12.47 × 19=
    13. 13.68 × 24=
    14. 14.92 × 51=
    15. 15.87 × 77=
    16. 16.19 × 25=
    17. 17.64 × 96=
    18. 18.64 × 89=
    19. 19.91 × 26=
    20. 20.71 × 35=

Answer Key

§1 · Close-together pairs

  1. 1.1620
  2. 2.2108
  3. 3.2639
  4. 4.2214
  5. 5.3869
  6. 6.1600
  7. 7.1344
  8. 8.473
  9. 9.2214
  10. 10.5369
  11. 11.1215
  12. 12.893
  13. 13.1632
  14. 14.4692
  15. 15.6699
  16. 16.475
  17. 17.6144
  18. 18.5696
  19. 19.2366
  20. 20.2485