Starter quiz
- Which addition calculation is represented by the base ten blocks?
- 34 + 35 =
- 43 + 35 = ✓
- 43 + 53 =
- 34 + 53 =
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- What is the missing sum in the column addition?
- '49' ✓
- What is 340 + 100?
- '440' ✓
- What is 410 + 70?
- '480' ✓
- What is the missing number in the column addition?
- '2' ✓
- What is the missing addend in this column addition?
- '40' ✓
Exit quiz
- Which addition calculation is represented by the base ten blocks?
- 34 + 42 =
- 24 + 32 =
- 124 + 132 = ✓
-
- What is the missing sum in the column addition?
- '733' ✓
- What is the value of the missing digit in the column addition?
- '7' ✓
- What is the missing digit in the column addition?
- '6' ✓
- What are the missing digits in the addend in the column addition?
- 1 and 3 ✓
- 4 and 6
- 2 and 2
-
- What is the missing addend?
- '157' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- When using column addition, start by adding numbers with the smallest place value first.
- Use zero to show that there are no tens or ones in a 3-digit number.
- Partition each number carefully into hundreds, tens and ones.
Common misconception
Pupils may not use zero to show that there are no tens or ones number in a 3-digit number. They may also use a zero to show that there are no hundreds when adding a 2-digit to a 3-digit number.
Emphasise with pupils that they need to use a zero only when needed. The number 75 would not be written as 075, so should not be written like this in column addition.
Keywords
Addend - An addend is a number added to another.
Sum - The sum is the the total when numbers are added together.
Column addition - Column addition is a way of adding numbers by writing a number below another.
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