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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 436 · 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. 2.69² =
  3. 3.49² =
  4. 4.89² =
  5. 5.91² =
  6. 6.51² =
  7. 7.19² =
  8. 8.89² =
  9. 9.21² =
  10. 10.31² =
  11. 11.59² =
  12. 12.31² =
  13. 13.81² =
  14. 14.81² =
  15. 15.19² =
  16. 16.59² =
  17. 17.91² =
  18. 18.21² =
  19. 19.81² =
  20. 20.91² =
  21. 21.91² =
  22. 22.51² =
  23. 23.81² =
  24. 24.39² =
  25. 25.19² =
  26. 26.59² =
  27. 27.49² =
  28. 28.79² =
  29. 29.51² =
  30. 30.31² =
  31. 31.21² =
  32. 32.21² =
  33. 33.19² =
  34. 34.79² =
  35. 35.69² =
  36. 36.29² =
  37. 37.79² =
  38. 38.71² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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