← Back to lesson·Advance A · W1 D4 · 2 drill sections · ~5 min

Advance A · Week 1 · Fundamentals

Day 4 Practice Worksheet — Special Multiplication Patterns

Squares ending in 5, and the same-first-digit / sum-to-10 trick.

Name
Date
Score

  1. §1Squares ending in 5

    ⏱ 2 min · 20 problems

    Timed drill — start a 2-minute timer, then solve in order. Goal: finish under time with full accuracy.

    1. 01.105²=
    2. 02.155²=
    3. 03.195²=
    4. 04.135²=
    5. 05.55²=
    6. 06.75²=
    7. 07.145²=
    8. 08.185²=
    9. 09.175²=
    10. 10.115²=
    11. 11.155²=
    12. 12.55²=
    13. 13.75²=
    14. 14.185²=
    15. 15.195²=
    16. 16.145²=
    17. 17.155²=
    18. 18.145²=
    19. 19.35²=
    20. 20.25²=

  2. §2Same-tens, last-digits-10

    ⏱ 3 min · 20 problems

    Timed drill — start a 3-minute timer, then solve in order. Goal: finish under time with full accuracy.

    1. 01.36 × 34=
    2. 02.38 × 32=
    3. 03.83 × 87=
    4. 04.29 × 21=
    5. 05.93 × 97=
    6. 06.66 × 64=
    7. 07.57 × 53=
    8. 08.95 × 95=
    9. 09.91 × 99=
    10. 10.23 × 27=
    11. 11.73 × 77=
    12. 12.37 × 33=
    13. 13.78 × 72=
    14. 14.16 × 14=
    15. 15.67 × 63=
    16. 16.35 × 35=
    17. 17.15 × 15=
    18. 18.49 × 41=
    19. 19.92 × 98=
    20. 20.31 × 39=

Answer Key

§1 · Squares ending in 5

  1. 1.11025
  2. 2.24025
  3. 3.38025
  4. 4.18225
  5. 5.3025
  6. 6.5625
  7. 7.21025
  8. 8.34225
  9. 9.30625
  10. 10.13225
  11. 11.24025
  12. 12.3025
  13. 13.5625
  14. 14.34225
  15. 15.38025
  16. 16.21025
  17. 17.24025
  18. 18.21025
  19. 19.1225
  20. 20.625

§2 · Same-tens, last-digits-10

  1. 1.1224
  2. 2.1216
  3. 3.7221
  4. 4.609
  5. 5.9021
  6. 6.4224
  7. 7.3021
  8. 8.9025
  9. 9.9009
  10. 10.621
  11. 11.5621
  12. 12.1221
  13. 13.5616
  14. 14.224
  15. 15.4221
  16. 16.1225
  17. 17.225
  18. 18.2009
  19. 19.9016
  20. 20.1209