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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 293 · 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. 1.59² =
  2. 2.29² =
  3. 3.29² =
  4. 4.51² =
  5. 5.49² =
  6. 6.39² =
  7. 7.61² =
  8. 8.51² =
  9. 9.91² =
  10. 10.39² =
  11. 11.21² =
  12. 12.71² =
  13. 13.51² =
  14. 14.81² =
  15. 15.31² =
  16. 16.89² =
  17. 17.39² =
  18. 18.61² =
  19. 19.49² =
  20. 20.21² =
  21. 21.21² =
  22. 22.21² =
  23. 23.29² =
  24. 24.51² =
  25. 25.79² =
  26. 26.59² =
  27. 27.49² =
  28. 28.21² =
  29. 29.59² =
  30. 30.71² =
  31. 31.71² =
  32. 32.19² =
  33. 33.59² =
  34. 34.49² =
  35. 35.39² =
  36. 36.49² =
  37. 37.39² =
  38. 38.89² =
  39. 39.69² =
  40. 40.39² =

Answer key

  1. 3481
  2. 841
  3. 841
  4. 2601
  5. 2401
  6. 1521
  7. 3721
  8. 2601
  9. 8281
  10. 1521
  11. 441
  12. 5041
  13. 2601
  14. 6561
  15. 961
  16. 7921
  17. 1521
  18. 3721
  19. 2401
  20. 441
  21. 441
  22. 441
  23. 841
  24. 2601
  25. 6241
  26. 3481
  27. 2401
  28. 441
  29. 3481
  30. 5041
  31. 5041
  32. 361
  33. 3481
  34. 2401
  35. 1521
  36. 2401
  37. 1521
  38. 7921
  39. 4761
  40. 1521

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