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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 13 · 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. 1.29² =
  2. 2.69² =
  3. 3.59² =
  4. 4.41² =
  5. 5.29² =
  6. 6.21² =
  7. 7.29² =
  8. 8.91² =
  9. 9.69² =
  10. 10.61² =
  11. 11.21² =
  12. 12.91² =
  13. 13.39² =
  14. 14.41² =
  15. 15.79² =
  16. 16.41² =
  17. 17.69² =
  18. 18.59² =
  19. 19.69² =
  20. 20.21² =
  21. 21.39² =
  22. 22.49² =
  23. 23.91² =
  24. 24.19² =
  25. 25.61² =
  26. 26.91² =
  27. 27.29² =
  28. 28.59² =
  29. 29.21² =
  30. 30.61² =
  31. 31.81² =
  32. 32.19² =
  33. 33.39² =
  34. 34.69² =
  35. 35.79² =
  36. 36.89² =
  37. 37.69² =
  38. 38.39² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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