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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 116 · 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. 1.59² =
  2. 2.29² =
  3. 3.79² =
  4. 4.21² =
  5. 5.61² =
  6. 6.19² =
  7. 7.41² =
  8. 8.39² =
  9. 9.61² =
  10. 10.49² =
  11. 11.49² =
  12. 12.59² =
  13. 13.31² =
  14. 14.91² =
  15. 15.69² =
  16. 16.49² =
  17. 17.39² =
  18. 18.91² =
  19. 19.21² =
  20. 20.51² =
  21. 21.71² =
  22. 22.19² =
  23. 23.41² =
  24. 24.91² =
  25. 25.29² =
  26. 26.21² =
  27. 27.31² =
  28. 28.79² =
  29. 29.69² =
  30. 30.69² =
  31. 31.19² =
  32. 32.31² =
  33. 33.39² =
  34. 34.61² =
  35. 35.19² =
  36. 36.89² =
  37. 37.59² =
  38. 38.31² =
  39. 39.81² =
  40. 40.91² =

Answer key

  1. 3481
  2. 841
  3. 6241
  4. 441
  5. 3721
  6. 361
  7. 1681
  8. 1521
  9. 3721
  10. 2401
  11. 2401
  12. 3481
  13. 961
  14. 8281
  15. 4761
  16. 2401
  17. 1521
  18. 8281
  19. 441
  20. 2601
  21. 5041
  22. 361
  23. 1681
  24. 8281
  25. 841
  26. 441
  27. 961
  28. 6241
  29. 4761
  30. 4761
  31. 361
  32. 961
  33. 1521
  34. 3721
  35. 361
  36. 7921
  37. 3481
  38. 961
  39. 6561
  40. 8281

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