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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 46 · 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. 1.31² =
  2. 2.21² =
  3. 3.71² =
  4. 4.19² =
  5. 5.41² =
  6. 6.69² =
  7. 7.89² =
  8. 8.29² =
  9. 9.91² =
  10. 10.69² =
  11. 11.59² =
  12. 12.71² =
  13. 13.69² =
  14. 14.89² =
  15. 15.29² =
  16. 16.59² =
  17. 17.51² =
  18. 18.79² =
  19. 19.71² =
  20. 20.59² =
  21. 21.29² =
  22. 22.79² =
  23. 23.39² =
  24. 24.69² =
  25. 25.91² =
  26. 26.31² =
  27. 27.71² =
  28. 28.49² =
  29. 29.39² =
  30. 30.29² =
  31. 31.81² =
  32. 32.81² =
  33. 33.89² =
  34. 34.21² =
  35. 35.81² =
  36. 36.19² =
  37. 37.31² =
  38. 38.39² =
  39. 39.49² =
  40. 40.19² =

Answer key

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

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