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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 567 · 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. 2.59² =
  3. 3.79² =
  4. 4.51² =
  5. 5.79² =
  6. 6.81² =
  7. 7.31² =
  8. 8.71² =
  9. 9.41² =
  10. 10.21² =
  11. 11.49² =
  12. 12.19² =
  13. 13.71² =
  14. 14.79² =
  15. 15.81² =
  16. 16.81² =
  17. 17.91² =
  18. 18.91² =
  19. 19.29² =
  20. 20.49² =
  21. 21.49² =
  22. 22.51² =
  23. 23.19² =
  24. 24.59² =
  25. 25.79² =
  26. 26.59² =
  27. 27.49² =
  28. 28.29² =
  29. 29.79² =
  30. 30.59² =
  31. 31.39² =
  32. 32.41² =
  33. 33.79² =
  34. 34.91² =
  35. 35.29² =
  36. 36.29² =
  37. 37.71² =
  38. 38.79² =
  39. 39.49² =
  40. 40.19² =

Answer key

  1. 3481
  2. 3481
  3. 6241
  4. 2601
  5. 6241
  6. 6561
  7. 961
  8. 5041
  9. 1681
  10. 441
  11. 2401
  12. 361
  13. 5041
  14. 6241
  15. 6561
  16. 6561
  17. 8281
  18. 8281
  19. 841
  20. 2401
  21. 2401
  22. 2601
  23. 361
  24. 3481
  25. 6241
  26. 3481
  27. 2401
  28. 841
  29. 6241
  30. 3481
  31. 1521
  32. 1681
  33. 6241
  34. 8281
  35. 841
  36. 841
  37. 5041
  38. 6241
  39. 2401
  40. 361

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