1. Written Addition – Objectives
Use column addition to add pairs of numbers with one or two decimal places;
Choose a method to add whole or decimal numbers.
You will need: Mini whiteboards
© Hamilton Trust Keeping Up Term Week 7 Day 3

2. Written Addition – Direct Teaching
Step 1: Write the numbers in columns, one above the other.
10s 1s s .
Step 2: Add the tenths column. Write the extra 1 in the 1s column.
10s 1s s 1
. 2
Remind students how they can use column addition to add pairs of numbers such as
Carefully talk through the carrying of the 1 from one column to the next.
Hints: Leave a space before drawing the lines. Write the decimal point in the answer so you don’t forget it later.
© Hamilton Trust Keeping Up Term Week 7 Day 3

3. Written Addition – Direct Teaching
Step 3: Add the 1s, including the extra one. Write the extra ten in the 10s column.
10s 1s s
1 1
Step 4: Add the tens column.
10s 1s s
1 1
Carefully talk through the carrying of the 10 from one column to the next.
© Hamilton Trust Keeping Up Term Week 7 Day 3

4. Written Addition – Student Activity
Fab 5s & Tasty 2s
Make a pair of three-digit numbers, each with one decimal place, and add them together. 9 7 5 3 2 1 8 4 6
Students write on mini whiteboards or in back of books. Partners check each other’s addition. Discuss as necessary.
Watch out for students who:
Make place value errors when using a written method (return to the expanded layout if necessary).
You score a point for every 2 or 5 in your answer!
© Hamilton Trust Keeping Up Term Week 7 Day 3

5. Written Addition – Direct Teaching
Write the numbers in columns, one above the other.
£10s £1s . 10p 1p .
Use the same
method for
adding money too…
Carefully talk through the carrying of the 10p from one column to the next.
Don’t forget the hundredths
or 1p column…!
Hints: Leave a space before drawing the lines. Write the decimal point in the answer so you don’t forget it later.
© Hamilton Trust Keeping Up Term Week 7 Day 3

6. Addition – Individual Practice These get harder… How far can you get?!
£ £3.99
£ £ £ £8.38
£ £47.85
Take feedback, asking students to describe their methods. The first three ought to be solved mentally.
HINT!
Just like last time, watch out for any calculations you might
be able to solve mentally!
© Hamilton Trust Keeping Up Term Week 7 Day 3