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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 526 · 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. 1.21² =
  2. 2.89² =
  3. 3.81² =
  4. 4.29² =
  5. 5.69² =
  6. 6.71² =
  7. 7.21² =
  8. 8.89² =
  9. 9.69² =
  10. 10.61² =
  11. 11.29² =
  12. 12.89² =
  13. 13.39² =
  14. 14.39² =
  15. 15.69² =
  16. 16.79² =
  17. 17.49² =
  18. 18.21² =
  19. 19.59² =
  20. 20.21² =
  21. 21.29² =
  22. 22.21² =
  23. 23.39² =
  24. 24.19² =
  25. 25.81² =
  26. 26.21² =
  27. 27.19² =
  28. 28.29² =
  29. 29.91² =
  30. 30.61² =
  31. 31.39² =
  32. 32.79² =
  33. 33.79² =
  34. 34.69² =
  35. 35.21² =
  36. 36.29² =
  37. 37.29² =
  38. 38.91² =
  39. 39.21² =
  40. 40.91² =

Answer key

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

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