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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 483 · 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. 1.81² =
  2. 2.61² =
  3. 3.39² =
  4. 4.59² =
  5. 5.39² =
  6. 6.59² =
  7. 7.19² =
  8. 8.49² =
  9. 9.79² =
  10. 10.31² =
  11. 11.61² =
  12. 12.79² =
  13. 13.91² =
  14. 14.71² =
  15. 15.71² =
  16. 16.89² =
  17. 17.49² =
  18. 18.91² =
  19. 19.79² =
  20. 20.61² =
  21. 21.69² =
  22. 22.49² =
  23. 23.49² =
  24. 24.21² =
  25. 25.81² =
  26. 26.81² =
  27. 27.19² =
  28. 28.19² =
  29. 29.51² =
  30. 30.51² =
  31. 31.89² =
  32. 32.89² =
  33. 33.49² =
  34. 34.91² =
  35. 35.91² =
  36. 36.79² =
  37. 37.81² =
  38. 38.69² =
  39. 39.51² =
  40. 40.39² =

Answer key

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

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