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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 346 · 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. 1.19² =
  2. 2.71² =
  3. 3.51² =
  4. 4.21² =
  5. 5.21² =
  6. 6.59² =
  7. 7.69² =
  8. 8.91² =
  9. 9.49² =
  10. 10.71² =
  11. 11.79² =
  12. 12.21² =
  13. 13.71² =
  14. 14.91² =
  15. 15.91² =
  16. 16.39² =
  17. 17.91² =
  18. 18.81² =
  19. 19.19² =
  20. 20.89² =
  21. 21.21² =
  22. 22.59² =
  23. 23.29² =
  24. 24.79² =
  25. 25.59² =
  26. 26.89² =
  27. 27.59² =
  28. 28.89² =
  29. 29.49² =
  30. 30.21² =
  31. 31.59² =
  32. 32.81² =
  33. 33.79² =
  34. 34.81² =
  35. 35.71² =
  36. 36.31² =
  37. 37.61² =
  38. 38.71² =
  39. 39.19² =
  40. 40.61² =

Answer key

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

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