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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 127 · 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. 2.81² =
  3. 3.29² =
  4. 4.19² =
  5. 5.89² =
  6. 6.19² =
  7. 7.89² =
  8. 8.79² =
  9. 9.19² =
  10. 10.69² =
  11. 11.21² =
  12. 12.29² =
  13. 13.89² =
  14. 14.69² =
  15. 15.41² =
  16. 16.21² =
  17. 17.69² =
  18. 18.51² =
  19. 19.61² =
  20. 20.41² =
  21. 21.39² =
  22. 22.69² =
  23. 23.71² =
  24. 24.19² =
  25. 25.91² =
  26. 26.81² =
  27. 27.81² =
  28. 28.19² =
  29. 29.81² =
  30. 30.69² =
  31. 31.41² =
  32. 32.59² =
  33. 33.71² =
  34. 34.81² =
  35. 35.29² =
  36. 36.91² =
  37. 37.69² =
  38. 38.49² =
  39. 39.49² =
  40. 40.71² =

Answer key

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

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