Video: Mentally Calculating 10 Less Than a Given Number

Fill in the blank: 43 − 10 = _.

01:10

Video Transcript

Fill in the blank: 43 subtract 10 equals what.

To help us subtract 10 from 43, let’s think about the value of 43. 43 has four tens, which is worth 40, and three ones. We have to take away 10. The ones digit won’t change because there’s nothing to subtract. We just need to subtract one 10 from the four tens we already have. We need to take away one ten from four, which will leave us with three tens. Four take away one is three. Four tens take away one ten leaves us with three tens. 43 subtract 10 equals 33.

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