Addition of 3 numbers up to 20

A multilevel approach to adding 3 numbers up to 20 with worksheets with counting, bridging 10, word problems, find the missing number, plus resources for whole class teaching on an interactive whiteboard. Watch the video here for a quick guide.

There are 9 Core Lessons each of which has Worksheets and a Teaching Resource.
Lesson 1 - Support through counting.
Lesson 2 - First strategy - solved in 2 stages first by adding the first two numbers.
Lesson 3 -Second strategy - solved in 2 stages, find 2 numbers that add up to 10.
Lesson 4 - Practice with a strategy of choice.
Lesson 5 - Word Problem introduction - numbers as digits.
Lesson 6 - Full word problems.
Lesson 7 - Find the missing number - numbers only.
Lesson 8 - Find the missing number Word Problem introduction - numbers as digits.
Lesson 9 - Find the missing number Full Word Problems.
Challenges - Lessons 10 & 11 are worksheets only.
Lesson 10 - Add 3 numbers up to a total of 50 - numbers only.
Lesson 11a & b - Find the missing number up to a total of 50.

How many Worksheets are there ?
(Virtually) Unlimited. This is because at the click of a button the numbers are randomised so the same Lesson Worksheet can be used again and again for classwork, homework, revision etc because the numbers will be different every time.

Answers are provided for all the Interactive Teaching Pages and Worksheets 2 to 11.

Interactive Teaching Resource
These are used by teachers and pupils on an Interactive Whiteboard or for one-to-one tuition with a PC/Mac computer to introduce the content of the Worksheets.

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