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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 749 · 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. 3.89² =
  4. 4.31² =
  5. 5.79² =
  6. 6.21² =
  7. 7.91² =
  8. 8.89² =
  9. 9.49² =
  10. 10.61² =
  11. 11.39² =
  12. 12.69² =
  13. 13.41² =
  14. 14.49² =
  15. 15.51² =
  16. 16.39² =
  17. 17.89² =
  18. 18.61² =
  19. 19.69² =
  20. 20.51² =
  21. 21.29² =
  22. 22.31² =
  23. 23.49² =
  24. 24.51² =
  25. 25.39² =
  26. 26.51² =
  27. 27.19² =
  28. 28.29² =
  29. 29.79² =
  30. 30.81² =
  31. 31.39² =
  32. 32.71² =
  33. 33.89² =
  34. 34.79² =
  35. 35.41² =
  36. 36.79² =
  37. 37.89² =
  38. 38.91² =
  39. 39.61² =
  40. 40.71² =

Answer key

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

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