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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 597 · 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. 1.49² =
  2. 2.51² =
  3. 3.71² =
  4. 4.69² =
  5. 5.41² =
  6. 6.59² =
  7. 7.21² =
  8. 8.29² =
  9. 9.41² =
  10. 10.71² =
  11. 11.81² =
  12. 12.69² =
  13. 13.59² =
  14. 14.91² =
  15. 15.19² =
  16. 16.89² =
  17. 17.69² =
  18. 18.61² =
  19. 19.81² =
  20. 20.51² =
  21. 21.89² =
  22. 22.79² =
  23. 23.91² =
  24. 24.49² =
  25. 25.31² =
  26. 26.39² =
  27. 27.91² =
  28. 28.19² =
  29. 29.79² =
  30. 30.31² =
  31. 31.71² =
  32. 32.49² =
  33. 33.69² =
  34. 34.41² =
  35. 35.51² =
  36. 36.79² =
  37. 37.89² =
  38. 38.51² =
  39. 39.19² =
  40. 40.91² =

Answer key

  1. 2401
  2. 2601
  3. 5041
  4. 4761
  5. 1681
  6. 3481
  7. 441
  8. 841
  9. 1681
  10. 5041
  11. 6561
  12. 4761
  13. 3481
  14. 8281
  15. 361
  16. 7921
  17. 4761
  18. 3721
  19. 6561
  20. 2601
  21. 7921
  22. 6241
  23. 8281
  24. 2401
  25. 961
  26. 1521
  27. 8281
  28. 361
  29. 6241
  30. 961
  31. 5041
  32. 2401
  33. 4761
  34. 1681
  35. 2601
  36. 6241
  37. 7921
  38. 2601
  39. 361
  40. 8281

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