Teaching children the basics of addition and subtraction can be done very effectively through the use of number bonds. These number bond worksheets are part of the Singapore math technique which is very popular with educators right now. This technique of teaching the bonds between numbers helps kids recognize that parts make up a whole. That basic concept sets kids up to gain an understanding of addition and subtraction at the same time. We have found these worksheets to be very effective in teaching elementary math and these worksheets are geared specifically towards 1st graders.