Do we need to borrow?

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คำแนะนำของผู้เขียน

First compare numbers. Start from right compare upper right and lower right numbers for example in question number  2  ,7 and 9 mark 7 and 9 in numbers grid compare if upper number is back to lower number mark the upper number with red .red means borrow .if upper number is front to lower number mark with green .green means no borrowing