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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 157 · 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. 1.39² =
  2. 2.39² =
  3. 3.59² =
  4. 4.81² =
  5. 5.89² =
  6. 6.79² =
  7. 7.89² =
  8. 8.29² =
  9. 9.71² =
  10. 10.81² =
  11. 11.31² =
  12. 12.91² =
  13. 13.39² =
  14. 14.41² =
  15. 15.19² =
  16. 16.89² =
  17. 17.21² =
  18. 18.49² =
  19. 19.51² =
  20. 20.81² =
  21. 21.79² =
  22. 22.39² =
  23. 23.19² =
  24. 24.31² =
  25. 25.69² =
  26. 26.49² =
  27. 27.29² =
  28. 28.31² =
  29. 29.49² =
  30. 30.41² =
  31. 31.51² =
  32. 32.59² =
  33. 33.39² =
  34. 34.69² =
  35. 35.49² =
  36. 36.69² =
  37. 37.69² =
  38. 38.21² =
  39. 39.29² =
  40. 40.79² =

Answer key

  1. 1521
  2. 1521
  3. 3481
  4. 6561
  5. 7921
  6. 6241
  7. 7921
  8. 841
  9. 5041
  10. 6561
  11. 961
  12. 8281
  13. 1521
  14. 1681
  15. 361
  16. 7921
  17. 441
  18. 2401
  19. 2601
  20. 6561
  21. 6241
  22. 1521
  23. 361
  24. 961
  25. 4761
  26. 2401
  27. 841
  28. 961
  29. 2401
  30. 1681
  31. 2601
  32. 3481
  33. 1521
  34. 4761
  35. 2401
  36. 4761
  37. 4761
  38. 441
  39. 841
  40. 6241

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