Connecting Addition and Subtraction within 20

There are a number of ways to understand the relationship between addition and subtraction: Thinking of them as opposites,one undoes the other, more or less, counting forward or backward (think of a number line) etc and of course as inverse operations. Whatever vocabulary or method you use, these resources aim to support your teaching through 6 possible stages using (almost) unlimited differentiated Worksheets and Interactive Teaching.

The Sets of worksheets are firstly separated into 2 levels, adding and subtracting up to 10 and then to 20. Within each range of numbers the 6 sets take the students from adding and subtracting using counting as a visual support to building equations using the inverse property of addition and subtraction:

1. Addition Equations
Count objects and complete the two addition equations that show the commutative nature of addition with the option to choose up to a total of 10 or 20.

2. Subtraction Equations
Count objects and complete the two subtraction equations with the option to choose up to a total of 10 or 20.

3. Number Bonds Starting with revision of number bonds there are 4 Sets of Worksheets finding the Sum or Part up to 10 and 20. There is also a blank template so you can set a challenge or pupils can create their own worksheets.

4. Families of numbers
Building on what has been learnt from the previous 5 sets, pupils now build the 4 possible equations given a family of 3 connected numbers

5. Inverse 1 - With the number line
By adding and subtracting the same number you return to the starting point. One undoes the other and are therefore opposites /inverses.
E.g. 10 + 5 - ? =10 or 12 -3 +? = 12

6. Inverse 2 - Building the Inverse Equation
E.g given the equation 7+ 12 = 19 complete the Equation 19 - ? = 7

Click-PRINT and Go - No Prep (almost) unlimited Worksheets
At the click of a button all the numbers are randomized providing you with (an almost) unlimited set of questions for classwork, revision, homework, and because they are straightforward and need little instruction they are ideal material to have ready for an end of lesson filler activity or material readily available for a replacement teacher.

The Teaching Pages are designed for use with the Interactive whiteboard for whole class teaching or on a PC or Mac for one-to-one tuition to help introduce the pupils to the content of each set of the Worksheets that follow.

Answers are automatically generated every time.

Note
These resources work with the official Adobe Acrobat Reader on Windows or Mac computers.

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Add and Subtract within 20 - Fluency with Equations

Addition of 3 numbers up to 20