Add and Subtract to 20 & Missing Number Problems

National Curriculum Year 1: Number - addition and subtraction

add and subtract one-digit and two-digit numbers to 20 including zero.
solve one-step problems that involve addition and subtraction, using concrete objects and pictorial representations, and missing number problems such as 7 = ? − 9

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.

The sets of (almost) unlimited worksheets are as follows:

1. Addition Equations
Count objects & 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. 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

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 they are ideal material to have ready for an end of lesson filler activity or 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.

You may also like:
Add and Subtract within 20 - Fluency with Equations

Addition of 3 numbers up to 20