Question Video: Subtracting One-Digit Numbers from Two-Digit Numbers without Regrouping | Nagwa Question Video: Subtracting One-Digit Numbers from Two-Digit Numbers without Regrouping | Nagwa

Question Video: Subtracting One-Digit Numbers from Two-Digit Numbers without Regrouping Mathematics • Second Year of Primary School

85 − 4 = _.

01:17

Video Transcript

85 subtract four equals what?

In this question, we’re starting off with a two-digit number and we’re subtracting a one-digit number from it. And we can use what we know about place value to help. We can think about the tens and the ones in our numbers. We know that 85 has eight 10s and five ones. And the number that we’re subtracting, four, is a one-digit number. There are some ones, but there are no tens at all. And because we’ve already split up our two-digit number into its tens and ones, we can start by subtracting the ones: five ones take away four ones.

We know that five take away four equals one. And so five ones subtract four ones equals one one. We also know that because we’re subtracting a one-digit number, there aren’t any tens to take away. We started with 85, and we found the answer by simply subtracting four ones. 85 take away four equals 81.

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