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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 681 · 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. 1.19² =
  2. 2.71² =
  3. 3.31² =
  4. 4.81² =
  5. 5.69² =
  6. 6.91² =
  7. 7.21² =
  8. 8.31² =
  9. 9.79² =
  10. 10.89² =
  11. 11.59² =
  12. 12.51² =
  13. 13.79² =
  14. 14.59² =
  15. 15.91² =
  16. 16.29² =
  17. 17.41² =
  18. 18.81² =
  19. 19.89² =
  20. 20.59² =
  21. 21.31² =
  22. 22.49² =
  23. 23.69² =
  24. 24.61² =
  25. 25.29² =
  26. 26.41² =
  27. 27.49² =
  28. 28.19² =
  29. 29.71² =
  30. 30.81² =
  31. 31.69² =
  32. 32.51² =
  33. 33.21² =
  34. 34.79² =
  35. 35.71² =
  36. 36.49² =
  37. 37.29² =
  38. 38.79² =
  39. 39.79² =
  40. 40.79² =

Answer key

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

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