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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 115 · 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. 1.41² =
  2. 2.89² =
  3. 3.41² =
  4. 4.91² =
  5. 5.61² =
  6. 6.21² =
  7. 7.61² =
  8. 8.61² =
  9. 9.91² =
  10. 10.49² =
  11. 11.29² =
  12. 12.19² =
  13. 13.69² =
  14. 14.21² =
  15. 15.29² =
  16. 16.69² =
  17. 17.91² =
  18. 18.89² =
  19. 19.91² =
  20. 20.41² =
  21. 21.31² =
  22. 22.19² =
  23. 23.69² =
  24. 24.91² =
  25. 25.21² =
  26. 26.21² =
  27. 27.71² =
  28. 28.41² =
  29. 29.81² =
  30. 30.71² =
  31. 31.79² =
  32. 32.89² =
  33. 33.49² =
  34. 34.51² =
  35. 35.31² =
  36. 36.89² =
  37. 37.39² =
  38. 38.79² =
  39. 39.89² =
  40. 40.89² =

Answer key

  1. 1681
  2. 7921
  3. 1681
  4. 8281
  5. 3721
  6. 441
  7. 3721
  8. 3721
  9. 8281
  10. 2401
  11. 841
  12. 361
  13. 4761
  14. 441
  15. 841
  16. 4761
  17. 8281
  18. 7921
  19. 8281
  20. 1681
  21. 961
  22. 361
  23. 4761
  24. 8281
  25. 441
  26. 441
  27. 5041
  28. 1681
  29. 6561
  30. 5041
  31. 6241
  32. 7921
  33. 2401
  34. 2601
  35. 961
  36. 7921
  37. 1521
  38. 6241
  39. 7921
  40. 7921

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