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Subtract by Breaking up Tens

- Grade 2 Math

Practice subtracting numbers within 1000 with carry at the ones place. While subtracting numbers using place value concept, students subtract ones from ones, tens from tens and hundreds from hundreds. In this method, sometimes it is necessary to break up tens into ones.

For example, the subtraction 353 - 34 can be viewed as:

  3 hundreds 5 tens 3 ones
-                    3 tens 4 ones   

We can write 5 tens and 3 ones in 353 as 4 tens and 13 ones, which makes it simpler to subtract, as shown below:

  3 hundreds 4 tens 13 ones
-                    3 tens 4 ones   
  3 hundreds 1 ten   9 ones

Subtract by Breaking up Tens Worksheet focuses on problems with such situations, where it is necessary to break up tens as ones. This concept is the precursor to the concept of carry in the standard algorithm. 

Common Core Alignment

2.NBT.7Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.