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Two-Digit Subtraction

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by

Quinn Graves

on 28 December 2012

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Transcript of Two-Digit Subtraction

Two-Digit
Subtraction Digit - A symbol used to make numerals. Regroup When To Regroup Practice! Remember:
Start with the ones.
Don't forget to subtract the tens.
Show your work! Vocabulary 145 numeral digit digit digit 7 is a one-digit number
17 is a two-digit number
170 is a three-digit number Subtraction- Taking one number away from another. Example: You have 5 ladybugs, you subtract 2, you are left with 3 ladybugs. 5 - 2 = 3 The symbol for subtraction is - Rearranging numbers in a math problem. For example: 25 - 17 - 25 17 = 2 5
-1 7 tens ones 2 5
-1 7 tens ones Always start with the ones! Always start from the top! 5 - 7 Can you take 7 away from 5? 2 5
-1 7 tens ones No! You need to regroup! - 25 17 Take a ten and make 10 ones 2 5
-1 7 tens ones = 2 tens
- 1 ten
1 ten 1 5 ones
+ 10 ones
15 ones 15 2 5
-1 7 tens ones 1 15 15 - 7 1 - 1 Solve! 0 8 Yay! You regrouped! Now solve it! 25 - 17 = 8 5 9
-2 5 tens ones Always start with the ones! Always start from the top! 5 9
-2 5 tens ones 9 - 5 Can you take 5 away from 9? Yes! - Do you need to regroup? No!! 8 2
-3 6 tens ones Always start with the ones! Always start from the top! 8 2
-3 6 tens ones 2 - 6 Can you take 6 away from 2? Yes! - Do you need to regroup? No! 8 2
-3 6 tens ones 8 tens
- 1 ten
7 tens
Take 1 ten and make 10 ones Regroup 5 9
-2 5 tens ones 9 - 5 5 - 2 3 4 2 ones
+10 ones
12 ones 7 12 8 2
-3 6 tens ones 7 12 7 - 3 12 - 6 4 6 4 3
-2 7 tens ones Always start with the ones! 3 13 Show your work! 1 6 Don't forget to subtract the tens. 1) 38
- 12 2) 52
- 45 3) 81
-19 4) 34 5) 73 6) 52
-21 -55 -27
Full transcript