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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 463 · 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. 1.51² =
  2. 2.39² =
  3. 3.71² =
  4. 4.31² =
  5. 5.29² =
  6. 6.49² =
  7. 7.21² =
  8. 8.51² =
  9. 9.21² =
  10. 10.81² =
  11. 11.61² =
  12. 12.39² =
  13. 13.69² =
  14. 14.39² =
  15. 15.89² =
  16. 16.79² =
  17. 17.21² =
  18. 18.31² =
  19. 19.19² =
  20. 20.89² =
  21. 21.19² =
  22. 22.91² =
  23. 23.19² =
  24. 24.49² =
  25. 25.29² =
  26. 26.29² =
  27. 27.69² =
  28. 28.61² =
  29. 29.81² =
  30. 30.31² =
  31. 31.89² =
  32. 32.61² =
  33. 33.39² =
  34. 34.89² =
  35. 35.91² =
  36. 36.61² =
  37. 37.91² =
  38. 38.39² =
  39. 39.61² =
  40. 40.39² =

Answer key

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

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