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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 296 · 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. 1.51² =
  2. 2.79² =
  3. 3.19² =
  4. 4.69² =
  5. 5.61² =
  6. 6.49² =
  7. 7.79² =
  8. 8.29² =
  9. 9.61² =
  10. 10.69² =
  11. 11.69² =
  12. 12.71² =
  13. 13.81² =
  14. 14.39² =
  15. 15.69² =
  16. 16.51² =
  17. 17.79² =
  18. 18.61² =
  19. 19.29² =
  20. 20.41² =
  21. 21.21² =
  22. 22.79² =
  23. 23.81² =
  24. 24.29² =
  25. 25.39² =
  26. 26.49² =
  27. 27.89² =
  28. 28.49² =
  29. 29.61² =
  30. 30.21² =
  31. 31.79² =
  32. 32.91² =
  33. 33.81² =
  34. 34.71² =
  35. 35.19² =
  36. 36.89² =
  37. 37.29² =
  38. 38.21² =
  39. 39.81² =
  40. 40.39² =

Answer key

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

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