Determine Unknown Whole Numbers - 1st Grade Math
Card 1 of 15
What number makes the equation true: $? + 3 = 12$?
What number makes the equation true: $? + 3 = 12$?
Tap to reveal answer
$9$. Subtract 3 from 12 to find the missing addend.
$9$. Subtract 3 from 12 to find the missing addend.
← Didn't Know|Knew It →
What number makes the equation true: $? + 4 = 9$?
What number makes the equation true: $? + 4 = 9$?
Tap to reveal answer
$5$. Subtract 4 from 9 to find the missing number.
$5$. Subtract 4 from 9 to find the missing number.
← Didn't Know|Knew It →
What number makes the equation true: $6 + 6 = ?$?
What number makes the equation true: $6 + 6 = ?$?
Tap to reveal answer
$12$. Add 6 plus 6 to get 12.
$12$. Add 6 plus 6 to get 12.
← Didn't Know|Knew It →
What number makes the equation true: $8 + ? = 11$?
What number makes the equation true: $8 + ? = 11$?
Tap to reveal answer
$3$. Add 3 to 8 to get 11.
$3$. Add 3 to 8 to get 11.
← Didn't Know|Knew It →
What number makes the equation true: $9 = ? - 1$?
What number makes the equation true: $9 = ? - 1$?
Tap to reveal answer
$10$. Add 1 to 9 to find the starting number.
$10$. Add 1 to 9 to find the starting number.
← Didn't Know|Knew It →
What number makes the equation true: $7 + ? = 7$?
What number makes the equation true: $7 + ? = 7$?
Tap to reveal answer
$0$. Adding 0 doesn't change the number.
$0$. Adding 0 doesn't change the number.
← Didn't Know|Knew It →
What number makes the equation true: $? - 0 = 11$?
What number makes the equation true: $? - 0 = 11$?
Tap to reveal answer
$11$. Subtracting 0 doesn't change the number.
$11$. Subtracting 0 doesn't change the number.
← Didn't Know|Knew It →
What number makes the equation true: $0 + ? = 6$?
What number makes the equation true: $0 + ? = 6$?
Tap to reveal answer
$6$. Adding 0 doesn't change the result.
$6$. Adding 0 doesn't change the result.
← Didn't Know|Knew It →
What number makes the equation true: $18 = 9 + ?$?
What number makes the equation true: $18 = 9 + ?$?
Tap to reveal answer
$9$. Subtract 9 from 18 to find the missing addend.
$9$. Subtract 9 from 18 to find the missing addend.
← Didn't Know|Knew It →
What number makes the equation true: $15 - 8 = ?$?
What number makes the equation true: $15 - 8 = ?$?
Tap to reveal answer
$7$. Subtract 8 from 15 to get 7.
$7$. Subtract 8 from 15 to get 7.
← Didn't Know|Knew It →
What number makes the equation true: $20 - ? = 13$?
What number makes the equation true: $20 - ? = 13$?
Tap to reveal answer
$7$. Subtract 13 from 20 to find what was taken away.
$7$. Subtract 13 from 20 to find what was taken away.
← Didn't Know|Knew It →
What number makes the equation true: $11 = 4 + ?$?
What number makes the equation true: $11 = 4 + ?$?
Tap to reveal answer
$7$. Subtract 4 from 11 to find the missing addend.
$7$. Subtract 4 from 11 to find the missing addend.
← Didn't Know|Knew It →
What number makes the equation true: $16 - ? = 10$?
What number makes the equation true: $16 - ? = 10$?
Tap to reveal answer
$6$. Subtract 10 from 16 to find what was taken away.
$6$. Subtract 10 from 16 to find what was taken away.
← Didn't Know|Knew It →
What number makes the equation true: $? + 7 = 15$?
What number makes the equation true: $? + 7 = 15$?
Tap to reveal answer
$8$. Subtract 7 from 15 to find the missing addend.
$8$. Subtract 7 from 15 to find the missing addend.
← Didn't Know|Knew It →
What number makes the equation true: $12 - 5 = ?$?
What number makes the equation true: $12 - 5 = ?$?
Tap to reveal answer
$7$. Subtract 5 from 12 to get 7.
$7$. Subtract 5 from 12 to get 7.
← Didn't Know|Knew It →