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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 45 · 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. 2.19² =
  3. 3.89² =
  4. 4.41² =
  5. 5.89² =
  6. 6.61² =
  7. 7.81² =
  8. 8.81² =
  9. 9.19² =
  10. 10.79² =
  11. 11.49² =
  12. 12.21² =
  13. 13.31² =
  14. 14.79² =
  15. 15.21² =
  16. 16.31² =
  17. 17.89² =
  18. 18.71² =
  19. 19.89² =
  20. 20.81² =
  21. 21.19² =
  22. 22.49² =
  23. 23.61² =
  24. 24.61² =
  25. 25.79² =
  26. 26.51² =
  27. 27.89² =
  28. 28.79² =
  29. 29.39² =
  30. 30.69² =
  31. 31.79² =
  32. 32.21² =
  33. 33.89² =
  34. 34.41² =
  35. 35.81² =
  36. 36.79² =
  37. 37.29² =
  38. 38.59² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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