← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 331 · 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. 2.61² =
  3. 3.59² =
  4. 4.29² =
  5. 5.59² =
  6. 6.59² =
  7. 7.91² =
  8. 8.41² =
  9. 9.49² =
  10. 10.21² =
  11. 11.69² =
  12. 12.41² =
  13. 13.71² =
  14. 14.59² =
  15. 15.49² =
  16. 16.91² =
  17. 17.89² =
  18. 18.59² =
  19. 19.61² =
  20. 20.29² =
  21. 21.91² =
  22. 22.61² =
  23. 23.59² =
  24. 24.91² =
  25. 25.69² =
  26. 26.81² =
  27. 27.79² =
  28. 28.59² =
  29. 29.51² =
  30. 30.41² =
  31. 31.91² =
  32. 32.29² =
  33. 33.41² =
  34. 34.79² =
  35. 35.69² =
  36. 36.19² =
  37. 37.89² =
  38. 38.49² =
  39. 39.81² =
  40. 40.19² =

Answer key

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

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