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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 537 · 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. 1.79² =
  2. 2.89² =
  3. 3.79² =
  4. 4.71² =
  5. 5.39² =
  6. 6.21² =
  7. 7.59² =
  8. 8.49² =
  9. 9.29² =
  10. 10.91² =
  11. 11.41² =
  12. 12.89² =
  13. 13.49² =
  14. 14.51² =
  15. 15.61² =
  16. 16.69² =
  17. 17.91² =
  18. 18.89² =
  19. 19.79² =
  20. 20.69² =
  21. 21.19² =
  22. 22.19² =
  23. 23.71² =
  24. 24.79² =
  25. 25.91² =
  26. 26.19² =
  27. 27.71² =
  28. 28.91² =
  29. 29.39² =
  30. 30.91² =
  31. 31.41² =
  32. 32.81² =
  33. 33.51² =
  34. 34.21² =
  35. 35.69² =
  36. 36.19² =
  37. 37.19² =
  38. 38.89² =
  39. 39.89² =
  40. 40.31² =

Answer key

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

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