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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 303 · 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. 1.39² =
  2. 2.19² =
  3. 3.39² =
  4. 4.51² =
  5. 5.71² =
  6. 6.21² =
  7. 7.39² =
  8. 8.59² =
  9. 9.39² =
  10. 10.89² =
  11. 11.29² =
  12. 12.89² =
  13. 13.49² =
  14. 14.31² =
  15. 15.41² =
  16. 16.21² =
  17. 17.49² =
  18. 18.19² =
  19. 19.49² =
  20. 20.21² =
  21. 21.79² =
  22. 22.21² =
  23. 23.59² =
  24. 24.61² =
  25. 25.29² =
  26. 26.49² =
  27. 27.81² =
  28. 28.49² =
  29. 29.89² =
  30. 30.69² =
  31. 31.49² =
  32. 32.89² =
  33. 33.21² =
  34. 34.69² =
  35. 35.39² =
  36. 36.31² =
  37. 37.89² =
  38. 38.61² =
  39. 39.29² =
  40. 40.19² =

Answer key

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

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