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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 344 · 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. 2.29² =
  3. 3.29² =
  4. 4.89² =
  5. 5.91² =
  6. 6.91² =
  7. 7.19² =
  8. 8.41² =
  9. 9.69² =
  10. 10.19² =
  11. 11.61² =
  12. 12.49² =
  13. 13.21² =
  14. 14.49² =
  15. 15.91² =
  16. 16.51² =
  17. 17.21² =
  18. 18.49² =
  19. 19.89² =
  20. 20.71² =
  21. 21.79² =
  22. 22.31² =
  23. 23.59² =
  24. 24.69² =
  25. 25.49² =
  26. 26.31² =
  27. 27.79² =
  28. 28.41² =
  29. 29.59² =
  30. 30.81² =
  31. 31.89² =
  32. 32.89² =
  33. 33.19² =
  34. 34.61² =
  35. 35.69² =
  36. 36.19² =
  37. 37.31² =
  38. 38.71² =
  39. 39.89² =
  40. 40.71² =

Answer key

  1. 841
  2. 841
  3. 841
  4. 7921
  5. 8281
  6. 8281
  7. 361
  8. 1681
  9. 4761
  10. 361
  11. 3721
  12. 2401
  13. 441
  14. 2401
  15. 8281
  16. 2601
  17. 441
  18. 2401
  19. 7921
  20. 5041
  21. 6241
  22. 961
  23. 3481
  24. 4761
  25. 2401
  26. 961
  27. 6241
  28. 1681
  29. 3481
  30. 6561
  31. 7921
  32. 7921
  33. 361
  34. 3721
  35. 4761
  36. 361
  37. 961
  38. 5041
  39. 7921
  40. 5041

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