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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 393 · 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. 2.91² =
  3. 3.91² =
  4. 4.41² =
  5. 5.41² =
  6. 6.39² =
  7. 7.21² =
  8. 8.39² =
  9. 9.39² =
  10. 10.29² =
  11. 11.41² =
  12. 12.51² =
  13. 13.39² =
  14. 14.41² =
  15. 15.51² =
  16. 16.81² =
  17. 17.89² =
  18. 18.51² =
  19. 19.21² =
  20. 20.71² =
  21. 21.71² =
  22. 22.89² =
  23. 23.49² =
  24. 24.39² =
  25. 25.89² =
  26. 26.29² =
  27. 27.29² =
  28. 28.79² =
  29. 29.81² =
  30. 30.79² =
  31. 31.71² =
  32. 32.89² =
  33. 33.41² =
  34. 34.91² =
  35. 35.81² =
  36. 36.89² =
  37. 37.81² =
  38. 38.19² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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