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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 297 · 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. 1.69² =
  2. 2.91² =
  3. 3.79² =
  4. 4.39² =
  5. 5.71² =
  6. 6.31² =
  7. 7.39² =
  8. 8.61² =
  9. 9.91² =
  10. 10.81² =
  11. 11.19² =
  12. 12.31² =
  13. 13.39² =
  14. 14.89² =
  15. 15.41² =
  16. 16.31² =
  17. 17.51² =
  18. 18.79² =
  19. 19.79² =
  20. 20.19² =
  21. 21.21² =
  22. 22.89² =
  23. 23.21² =
  24. 24.79² =
  25. 25.69² =
  26. 26.41² =
  27. 27.79² =
  28. 28.89² =
  29. 29.39² =
  30. 30.49² =
  31. 31.21² =
  32. 32.89² =
  33. 33.59² =
  34. 34.19² =
  35. 35.61² =
  36. 36.61² =
  37. 37.71² =
  38. 38.49² =
  39. 39.31² =
  40. 40.71² =

Answer key

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

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