Starter quiz
- Match the expressions that have the same value.
- 65 − 30 − 2⇔65 − 32 ✓
- 74 − 4 − 40⇔74 − 44 ✓
- 26 − 3 − 10⇔26 − 13 ✓
- Which number is missing in the equation? 89 − 28 = 89 − 8 − ______
- '20' ✓
Which equation is represented by the number line?- 76 − 23 = 44
- 76 − 32 = 44 ✓
- 76 − 46 = 44
-
Find the missing part in the bar model.- '22' ✓
- How many tens are in the missing part? 95 − _2 = 23
- 6 tens
- 7 tens ✓
- 8 tens
-
- Find the missing part. 67 − ______ = 34
- '33' ✓
Exit quiz
- Which bar model represents the problem shown? First, there were 47 cows in the field. Then, 3 left, then 20 more left. How many cows are left in the field now?
A ✓
B
C ✓
- Which number line represents what has happened in the problem? First, there were 87 sheep in the field. Then, 5 left, then 20 more left. How many cows are left in the field now?
A
B ✓
C ✓
Izzy had 56 p and spent 25 p. How much money does she have left? Use the coins shown to help you find out.- 31 p ✓
- 21 p
- 16 p
-
- Which number line represents what has happened in the problem? I had 69 sweets in my bag. 34 were gobstoppers and the rest were bon-bons. How many were bon-bons?
A
B ✓
C
- Andeep counts 87 minibeasts in the garden. 35 were ants and the rest were woodlice. How many woodlice were there? Which equation would solve this problem?
- 87 − 35 = 52 ✓
- 87 − 5 − 30 = 52 ✓
- 87 − 3 − 5 = 79
-
- There are 86 crows on the farmer’s field and 53 fly away. How many crows are left? Write the equation to solve this problem.
- '86 − 53 = 33' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- When subtracting a 2-digit number, the known part can be partitioned to subtract the tens and the ones separately.
- Partitioning both the whole and the parts when subtracting gives an correct answer when the ones digits bridge 10
- The tens and ones can be subtracted in any order and the remaining part will stay the same.
Common misconception
Children may think that, when partitioned, the tens and ones must be subtracted in the same order as they occur in the two-digit number, e.g. that to subtract 34, you must subtract 30, then 4
Explore subtracting tens and ones in any order at this point, looking at the result of this and considering which they find easier.
Keywords
Partition - To split a whole up into parts - a piece or section of a whole.
Part - A piece or section of a whole.
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