Split the Second Number, Add the Tens, Then Add the Ones
Split the second number into tens and ones. Add tens first, then ones.
TechniqueP3Ready
Good for adding fast.
Addition β’ Techniques
Step-by-step methods for mental addition (teacher demo + pupil practice).
Total: 4
Split Both Numbers, Add the Tens, Add the Ones
Split both numbers into tens and ones, then add the tens and add the ones
TechniqueP3Ready
Good for no regrouping (e.g., 45 + 12).
Add 2 Numbers. 1 of the Numbers is Near 100 (One Number 91β99)
Compensation method: make 100 first, then adjust.
TechniqueP3Ready
Example: 97 + 56 β (100 + 56) β 3.
Add Two Numbers Near 100. Both Numbers are 95 and Above
Use double-compensation: round to 100s, then subtract extras.
TechniqueP3Ready
Fast for pairs like 98 + 96.
Subtraction β’ Techniques
Mental subtraction methods (especially regrouping + compensation).
Total: 3
Split 2 Numbers. Subtract Tens, then Subtract Ones. Good for No Regrouping!
Subtract Tens, then Subtract Ones
TechniqueP3Ready
Subtract Tens, then Ones
Round the Single Digit Number to be Subtracted to Nearest Ten. Subtract Tens then Add Extra.
Subtract Tens then Add Extra.Useful for subtracting single digit!
TechniqueP3Ready
Good for subtracting single digit.
Round the Double Digit Number to be Subtracted to Nearest Ten. Subtract Tens then Add Extra.
Compensation method: Subtract Tens, then add the extra.Useful for subtracting double digit!
TechniqueP3Ready
Example: 78 - 69 β (78 β 70) + 1.Good for subtracting 19,29,39,49,59,69,79,89 and 99