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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 288 · 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. 1.71² =
  2. 2.19² =
  3. 3.31² =
  4. 4.49² =
  5. 5.49² =
  6. 6.59² =
  7. 7.61² =
  8. 8.51² =
  9. 9.19² =
  10. 10.21² =
  11. 11.69² =
  12. 12.41² =
  13. 13.41² =
  14. 14.89² =
  15. 15.59² =
  16. 16.79² =
  17. 17.19² =
  18. 18.49² =
  19. 19.41² =
  20. 20.49² =
  21. 21.41² =
  22. 22.69² =
  23. 23.69² =
  24. 24.31² =
  25. 25.59² =
  26. 26.19² =
  27. 27.51² =
  28. 28.79² =
  29. 29.21² =
  30. 30.49² =
  31. 31.31² =
  32. 32.41² =
  33. 33.49² =
  34. 34.39² =
  35. 35.51² =
  36. 36.81² =
  37. 37.89² =
  38. 38.79² =
  39. 39.69² =
  40. 40.19² =

Answer key

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

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