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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 236 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.89² =
  2. 2.69² =
  3. 3.61² =
  4. 4.49² =
  5. 5.49² =
  6. 6.51² =
  7. 7.59² =
  8. 8.39² =
  9. 9.41² =
  10. 10.31² =
  11. 11.89² =
  12. 12.41² =
  13. 13.89² =
  14. 14.49² =
  15. 15.49² =
  16. 16.49² =
  17. 17.69² =
  18. 18.69² =
  19. 19.51² =
  20. 20.31² =
  21. 21.91² =
  22. 22.21² =
  23. 23.79² =
  24. 24.89² =
  25. 25.49² =
  26. 26.61² =
  27. 27.51² =
  28. 28.61² =
  29. 29.81² =
  30. 30.69² =
  31. 31.49² =
  32. 32.69² =
  33. 33.39² =
  34. 34.81² =
  35. 35.79² =
  36. 36.81² =
  37. 37.69² =
  38. 38.71² =
  39. 39.69² =
  40. 40.19² =

Answer key

  1. 7921
  2. 4761
  3. 3721
  4. 2401
  5. 2401
  6. 2601
  7. 3481
  8. 1521
  9. 1681
  10. 961
  11. 7921
  12. 1681
  13. 7921
  14. 2401
  15. 2401
  16. 2401
  17. 4761
  18. 4761
  19. 2601
  20. 961
  21. 8281
  22. 441
  23. 6241
  24. 7921
  25. 2401
  26. 3721
  27. 2601
  28. 3721
  29. 6561
  30. 4761
  31. 2401
  32. 4761
  33. 1521
  34. 6561
  35. 6241
  36. 6561
  37. 4761
  38. 5041
  39. 4761
  40. 361

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