← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 574 · 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. 2.71² =
  3. 3.69² =
  4. 4.79² =
  5. 5.29² =
  6. 6.29² =
  7. 7.69² =
  8. 8.69² =
  9. 9.81² =
  10. 10.49² =
  11. 11.59² =
  12. 12.49² =
  13. 13.19² =
  14. 14.29² =
  15. 15.69² =
  16. 16.21² =
  17. 17.79² =
  18. 18.39² =
  19. 19.29² =
  20. 20.31² =
  21. 21.29² =
  22. 22.91² =
  23. 23.79² =
  24. 24.19² =
  25. 25.61² =
  26. 26.89² =
  27. 27.89² =
  28. 28.71² =
  29. 29.49² =
  30. 30.79² =
  31. 31.21² =
  32. 32.91² =
  33. 33.19² =
  34. 34.61² =
  35. 35.21² =
  36. 36.79² =
  37. 37.31² =
  38. 38.79² =
  39. 39.49² =
  40. 40.31² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths