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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

At first u just study the squares of numbers ( to 10) then u have to study multilpication. u can understand that 1²=1(odd number is 1) 2² =4(4) 3² =9(9) 4² =(16(6) 5²= 25(5) 6²= 36(6) 7²=49(9) 8²=64(4) 9²=81(1) 10²=100(0)

now u can find roots easily, eg. √1681= In this number (1) is the place of odd number. we know that it will be a number that's odd number is 1 or 9 4*4=16 so we can easily calcuculate 40*40=1600 1681 is near the number 1600 so 1681's root is 41