Relate Counting To Addition And Subtraction - 1st Grade Math
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What is $9 - 3$ using counting back?
What is $9 - 3$ using counting back?
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$6$. Start at $9$ and count back $3$: $8, 7, 6$.
$6$. Start at $9$ and count back $3$: $8, 7, 6$.
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What is $8 + 1$ using counting on?
What is $8 + 1$ using counting on?
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$9$. Start at $8$ and count on $1$: $9$.
$9$. Start at $8$ and count on $1$: $9$.
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What is $7 + 4$ using counting on?
What is $7 + 4$ using counting on?
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$11$. Start at $7$ and count on $4$: $8, 9, 10, 11$.
$11$. Start at $7$ and count on $4$: $8, 9, 10, 11$.
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What is $6 + 2$ using counting on?
What is $6 + 2$ using counting on?
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$8$. Start at $6$ and count on $2$: $7, 8$.
$8$. Start at $6$ and count on $2$: $7, 8$.
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What does it mean to count back in $9 - 2$?
What does it mean to count back in $9 - 2$?
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Start at $9$ and say $2$ numbers back: $8, 7$. Counting back means starting at the first number and counting backward.
Start at $9$ and say $2$ numbers back: $8, 7$. Counting back means starting at the first number and counting backward.
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Identify the missing subtrahend by counting back: $16 - = 12$.
Identify the missing subtrahend by counting back: $16 - = 12$.
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$4$. Count back from $16$ to $12$: $15, 14, 13, 12$ is $4$ steps.
$4$. Count back from $16$ to $12$: $15, 14, 13, 12$ is $4$ steps.
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What is $13 - 4$ using counting back?
What is $13 - 4$ using counting back?
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$9$. Start at $13$ and count back $4$: $12, 11, 10, 9$.
$9$. Start at $13$ and count back $4$: $12, 11, 10, 9$.
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What is $12 + 5$ using counting on?
What is $12 + 5$ using counting on?
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$17$. Start at $12$ and count on $5$: $13, 14, 15, 16, 17$.
$17$. Start at $12$ and count on $5$: $13, 14, 15, 16, 17$.
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What is $10 + 3$ using counting on?
What is $10 + 3$ using counting on?
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$13$. Start at $10$ and count on $3$: $11, 12, 13$.
$13$. Start at $10$ and count on $3$: $11, 12, 13$.
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What is $11 - 1$ using counting back?
What is $11 - 1$ using counting back?
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$10$. Start at $11$ and count back $1$: $10$.
$10$. Start at $11$ and count back $1$: $10$.
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What is $15 - 5$ using counting back?
What is $15 - 5$ using counting back?
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$10$. Start at $15$ and count back $5$: $14, 13, 12, 11, 10$.
$10$. Start at $15$ and count back $5$: $14, 13, 12, 11, 10$.
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What is $14 - 2$ using counting back?
What is $14 - 2$ using counting back?
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$12$. Start at $14$ and count back $2$: $13, 12$.
$12$. Start at $14$ and count back $2$: $13, 12$.
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What number makes this true: $6 + = 9$?
What number makes this true: $6 + = 9$?
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$3$. Count on from $6$ to $9$: $7, 8, 9$ is $3$ steps.
$3$. Count on from $6$ to $9$: $7, 8, 9$ is $3$ steps.
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What number makes this true: $12 - = 10$?
What number makes this true: $12 - = 10$?
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$2$. Count back from $12$ to $10$: $11, 10$ is $2$ steps.
$2$. Count back from $12$ to $10$: $11, 10$ is $2$ steps.
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What number makes this true: $ + 4 = 11$?
What number makes this true: $ + 4 = 11$?
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$7$. Count back from $11$ to find what plus $4$ equals $11$.
$7$. Count back from $11$ to find what plus $4$ equals $11$.
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