"I can do Tsurukame-zan (crane and turtle problems), but I freeze up when it comes to compensation problems." is rare to hear ...
This is great for consolidating mental maths skills for addition and subtraction. Compensating: when a number can be rounded to the nearest 10 easily, add or subtract the nearest 10 and then take-away ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results