Add Four Two-Digit Numbers - 2nd Grade Math
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What is $33 + 28 + 47$ (add in any order)?
What is $33 + 28 + 47$ (add in any order)?
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$108$. $33 + 47 = 80$, then $80 + 28 = 108$.
$108$. $33 + 47 = 80$, then $80 + 28 = 108$.
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What is $24 + 39 + 16 + 21$ (group to make $40$ and $60$)?
What is $24 + 39 + 16 + 21$ (group to make $40$ and $60$)?
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$100$. $24 + 16 = 40$ and $39 + 21 = 60$, so $40 + 60 = 100$.
$100$. $24 + 16 = 40$ and $39 + 21 = 60$, so $40 + 60 = 100$.
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What is $11 + 22 + 33 + 44$ (add in any order)?
What is $11 + 22 + 33 + 44$ (add in any order)?
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$110$. $11 + 44 = 55$ and $22 + 33 = 55$, so $55 + 55 = 110$.
$110$. $11 + 44 = 55$ and $22 + 33 = 55$, so $55 + 55 = 110$.
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What is $36 + 48 + 14$ (make a ten with $36$ and $14$)?
What is $36 + 48 + 14$ (make a ten with $36$ and $14$)?
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$98$. $36 + 14 = 50$, then $50 + 48 = 98$.
$98$. $36 + 14 = 50$, then $50 + 48 = 98$.
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What is $72 + 19 + 9$ (use compensation and make a ten)?
What is $72 + 19 + 9$ (use compensation and make a ten)?
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$100$. $72 + 20 - 1 + 9 = 100$ (use 20 for 19, then adjust).
$100$. $72 + 20 - 1 + 9 = 100$ (use 20 for 19, then adjust).
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What is the value of $3$ tens and $7$ ones written as a number?
What is the value of $3$ tens and $7$ ones written as a number?
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$37$. 3 tens = 30, plus 7 ones = 37.
$37$. 3 tens = 30, plus 7 ones = 37.
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What is $48 + 35$ using place value (add tens, then ones)?
What is $48 + 35$ using place value (add tens, then ones)?
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$83$. Add tens: $40 + 30 = 70$, then ones: $8 + 5 = 13$, so $70 + 13 = 83$.
$83$. Add tens: $40 + 30 = 70$, then ones: $8 + 5 = 13$, so $70 + 13 = 83$.
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What is $29 + 17$ (make a new ten if needed)?
What is $29 + 17$ (make a new ten if needed)?
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$46$. $9 + 7 = 16$, carry 1 ten; $20 + 10 + 10 = 40$, plus 6 ones = 46.
$46$. $9 + 7 = 16$, carry 1 ten; $20 + 10 + 10 = 40$, plus 6 ones = 46.
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What is $59 + 41 + 12$ (look for a pair that makes $100$)?
What is $59 + 41 + 12$ (look for a pair that makes $100$)?
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$112$. $59 + 41 = 100$, then $100 + 12 = 112$.
$112$. $59 + 41 = 100$, then $100 + 12 = 112$.
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What is $40 + 26 + 30 + 14$ (use tens and ones)?
What is $40 + 26 + 30 + 14$ (use tens and ones)?
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$110$. Tens: $40 + 30 = 70$, ones: $26 + 14 = 40$, so $70 + 40 = 110$.
$110$. Tens: $40 + 30 = 70$, ones: $26 + 14 = 40$, so $70 + 40 = 110$.
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What is $32 + 46 + 18$ (add tens first, then ones)?
What is $32 + 46 + 18$ (add tens first, then ones)?
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$96$. Tens: $30 + 40 + 10 = 80$, ones: $2 + 6 + 8 = 16$, so $80 + 16 = 96$.
$96$. Tens: $30 + 40 + 10 = 80$, ones: $2 + 6 + 8 = 16$, so $80 + 16 = 96$.
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What is $58 + 27 + 13$ (make a ten with $27$ and $13$)?
What is $58 + 27 + 13$ (make a ten with $27$ and $13$)?
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$98$. $27 + 13 = 40$, then $58 + 40 = 98$.
$98$. $27 + 13 = 40$, then $58 + 40 = 98$.
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What is $16 + 27 + 34$ (add in any order)?
What is $16 + 27 + 34$ (add in any order)?
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$77$. $16 + 34 = 50$, then $50 + 27 = 77$.
$77$. $16 + 34 = 50$, then $50 + 27 = 77$.
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What is $25 + 25 + 25 + 25$ (use repeated addition)?
What is $25 + 25 + 25 + 25$ (use repeated addition)?
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$100$. Four 25s make 100 (like 4 quarters = $1).
$100$. Four 25s make 100 (like 4 quarters = $1).
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What is $14 + 26 + 36 + 24$ (pair numbers to make tens)?
What is $14 + 26 + 36 + 24$ (pair numbers to make tens)?
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$100$. $14 + 36 = 50$ and $26 + 24 = 50$, so $50 + 50 = 100$.
$100$. $14 + 36 = 50$ and $26 + 24 = 50$, so $50 + 50 = 100$.
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