Euan is explaining 23-12.
First he finds 23 on the number square and colours it in.
Euan knows he must partition 12 into 10 + 2.
He jumps up one place because 12 has one 10.
He moves left two places because 12 has two units.
Year 1 Upland Primary School
Wednesday 2 July 2014
Subtraction using a number square
Do you know how to subtract using a number square? We have been practising this skill. Click on the hyperlink to watch a clear explanation. You need to know how to partition a number into tens and units to use this method.
Euan is explaining 23-12.
First he finds 23 on the number square and colours it in.
Euan knows he must partition 12 into 10 + 2.
He jumps up one place because 12 has one 10.
He moves left two places because 12 has two units.
Euan is explaining 23-12.
First he finds 23 on the number square and colours it in.
Euan knows he must partition 12 into 10 + 2.
He jumps up one place because 12 has one 10.
He moves left two places because 12 has two units.
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Well done Euan, that is fantastic use of the 100 square - keep it up!
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