Subtract Multiples of 10 - 1st Grade Math
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What does it mean to subtract $30$ from $80$ using tens (place value)?
What does it mean to subtract $30$ from $80$ using tens (place value)?
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Subtract $3$ tens from $8$ tens. Think of it as taking away groups of ten.
Subtract $3$ tens from $8$ tens. Think of it as taking away groups of ten.
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Which addition fact checks the subtraction $80 - 30 = 50$?
Which addition fact checks the subtraction $80 - 30 = 50$?
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$50 + 30 = 80$. Addition and subtraction are inverse operations.
$50 + 30 = 80$. Addition and subtraction are inverse operations.
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What is $50 - 40$?
What is $50 - 40$?
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$10$. $5$ tens minus $4$ tens equals $1$ ten.
$10$. $5$ tens minus $4$ tens equals $1$ ten.
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What is $40 - 10$?
What is $40 - 10$?
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$30$. $4$ tens minus $1$ ten equals $3$ tens.
$30$. $4$ tens minus $1$ ten equals $3$ tens.
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What is $90 - 90$?
What is $90 - 90$?
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$0$. Any number minus itself equals zero.
$0$. Any number minus itself equals zero.
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What is $30 - 20$?
What is $30 - 20$?
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$10$. $3$ tens minus $2$ tens equals $1$ ten.
$10$. $3$ tens minus $2$ tens equals $1$ ten.
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What is $20 - 10$?
What is $20 - 10$?
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$10$. $2$ tens minus $1$ ten equals $1$ ten.
$10$. $2$ tens minus $1$ ten equals $1$ ten.
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What is $90 - 40$?
What is $90 - 40$?
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$50$. $9$ tens minus $4$ tens equals $5$ tens.
$50$. $9$ tens minus $4$ tens equals $5$ tens.
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What is $70 - 50$?
What is $70 - 50$?
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$20$. $7$ tens minus $5$ tens equals $2$ tens.
$20$. $7$ tens minus $5$ tens equals $2$ tens.
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What does the digit $7$ mean in the number $70$ when using tens?
What does the digit $7$ mean in the number $70$ when using tens?
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$70$ means $7$ tens. In place value, the digit shows how many groups of ten.
$70$ means $7$ tens. In place value, the digit shows how many groups of ten.
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What is $80 - 30$?
What is $80 - 30$?
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$50$. $8$ tens minus $3$ tens equals $5$ tens.
$50$. $8$ tens minus $3$ tens equals $5$ tens.
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What is the value of $40 - 10$?
What is the value of $40 - 10$?
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$30$. Subtract the tens digits: $4 - 1 = 3$, so $40 - 10 = 30$.
$30$. Subtract the tens digits: $4 - 1 = 3$, so $40 - 10 = 30$.
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What is the value of $90 - 70$?
What is the value of $90 - 70$?
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$20$. Subtract the tens digits: $9 - 7 = 2$, so $90 - 70 = 20$.
$20$. Subtract the tens digits: $9 - 7 = 2$, so $90 - 70 = 20$.
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What is the value of $60 - 50$?
What is the value of $60 - 50$?
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$10$. Subtract the tens digits: $6 - 5 = 1$, so $60 - 50 = 10$.
$10$. Subtract the tens digits: $6 - 5 = 1$, so $60 - 50 = 10$.
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What is the value of $40 - 20$?
What is the value of $40 - 20$?
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$20$. Subtract the tens digits: $4 - 2 = 2$, so $40 - 20 = 20$.
$20$. Subtract the tens digits: $4 - 2 = 2$, so $40 - 20 = 20$.
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