← 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. 02.125²=
    3. 03.55²=
    4. 04.135²=
    5. 05.175²=
    6. 06.175²=
    7. 07.55²=
    8. 08.35²=
    9. 09.65²=
    10. 10.65²=
    11. 11.15²=
    12. 12.35²=
    13. 13.65²=
    14. 14.155²=
    15. 15.175²=
    16. 16.125²=
    17. 17.175²=
    18. 18.135²=
    19. 19.45²=
    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. 01.84 × 86=
    2. 02.56 × 54=
    3. 03.75 × 75=
    4. 04.21 × 29=
    5. 05.91 × 99=
    6. 06.26 × 24=
    7. 07.61 × 69=
    8. 08.61 × 69=
    9. 09.86 × 84=
    10. 10.83 × 87=
    11. 11.88 × 82=
    12. 12.96 × 94=
    13. 13.26 × 24=
    14. 14.18 × 12=
    15. 15.52 × 58=
    16. 16.38 × 32=
    17. 17.61 × 69=
    18. 18.36 × 34=
    19. 19.65 × 65=
    20. 20.73 × 77=

Answer Key

§1 · Squares ending in 5

  1. 1.11025
  2. 2.15625
  3. 3.3025
  4. 4.18225
  5. 5.30625
  6. 6.30625
  7. 7.3025
  8. 8.1225
  9. 9.4225
  10. 10.4225
  11. 11.225
  12. 12.1225
  13. 13.4225
  14. 14.24025
  15. 15.30625
  16. 16.15625
  17. 17.30625
  18. 18.18225
  19. 19.2025
  20. 20.625

§2 · Same-tens, last-digits-10

  1. 1.7224
  2. 2.3024
  3. 3.5625
  4. 4.609
  5. 5.9009
  6. 6.624
  7. 7.4209
  8. 8.4209
  9. 9.7224
  10. 10.7221
  11. 11.7216
  12. 12.9024
  13. 13.624
  14. 14.216
  15. 15.3016
  16. 16.1216
  17. 17.4209
  18. 18.1224
  19. 19.4225
  20. 20.5621