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Build numbers with tens and ones. Partition, swap digits, and read each place value. Use blocks or drawings to show how numbers change when tens and ones move.
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(quiz starts below)
Fascinating Fact:
Swap digits, new value. 24 is 2 tens and 4 ones. 42 is 4 tens and 2 ones. The value changes.
In KS1 Maths, pupils partition two-digit numbers into tens and ones, then put them back together to make the whole. This builds strong place value ideas for comparing and calculating.
Key Terms
Place value: What a digit is worth because of where it sits, such as tens or ones.
Partition: Split a number into parts, for example 37 into 3 tens and 7 ones.
Expanded form: A number written as tens plus ones, for example 37 = 30 + 7.
Practise partitioning with the Numeracy Game to build quick, confident place value skills.
Frequently Asked Questions (Click to see answers)
How do I partition a two-digit number in KS1?
Count the tens and ones. For 58, there are 5 tens and 8 ones. In expanded form, 58 = 50 + 8.
What does expanded form mean for place value?
Expanded form shows the value of each digit added together. For 46, write 40 + 6 to make the total.
Does swapping digits always change the number’s size?
Yes. Swapping digits changes which is tens and which is ones. 24 and 42 use the same digits but have different values.