Question

5•17+_____=90. ____-72:4=12. 13•4+____=70. ____-84:6=15. 16•3+____=80. ____-56:8=24

Answer 1

5•17+5=90. 30-72:4=12. 13•4+18=70. 20,25-84:16=15. 16•3+32=80. 31-56:8=24

Answer 2

Using algebraic expressions, we can solve for the missing numbers in each equation:

5•17 + ____ = 90

We want to find the missing number that, when added to 5•17, equals 90. We can start by simplifying 5•17:

5•17 = 85

Subtracting 85 from both sides of the equation, we get:

5•17 + ____ - 85 = 90 - 85

Simplifying further, we get:

5•17 + ____ - 85 = 5

Now we can solve for the missing number:

5•17 + ____ = 90

85 + ____ = 90

____ = 5

So the missing number is 5.

____ - 72 : 4 = 12

We want to find the missing number that, when divided by 4 and then added to 72, equals 12. We can start by multiplying both sides of the equation by 4:

____ - 72 = 12•4

Simplifying, we get:

____ - 72 = 48

Adding 72 to both sides of the equation, we get:

____ = 48 + 72

____ = 120

So the missing number is 120.

13•4 + ____ = 70

We want to find the missing number that, when added to 13•4, equals 70. We can start by simplifying 13•4:

13•4 = 52

Subtracting 52 from both sides of the equation, we get:

13•4 + ____ - 52 = 70 - 52

Simplifying further, we get:

13•4 + ____ - 52 = 18

Now we can solve for the missing number:

13•4 + ____ = 70

52 + ____ = 18

____ = 18 - 52

____ = -34

So the missing number is -34.

____ - 84 : 6 = 15

We want to find the missing number that, when divided by 6 and then added to 84, equals 15. We can start by multiplying both sides of the equation by 6:

____ - 84 = 15•6

Simplifying, we get:

____ - 84 = 90

Adding 84 to both sides of the equation, we get:

____ = 90 + 84

____ = 174

So the missing number is 174.

16•3 + ____ = 80

We want to find the missing number that, when added to 16•3, equals 80. We can start by simplifying 16•3:

16•3 = 48

Subtracting 48 from both sides of the equation, we get:

16•3 + ____ - 48 = 80 - 48

Simplifying further, we get:

16•3 + ____ - 48 = 32

Now we can solve for the missing number:

16•3 + ____ = 80

48 + ____ = 32

____ = 32 - 48

____ = -16

So the missing number is -16.

____ - 56 : 8 = 24

We want to find the missing number that, when divided by 8 and then added to 56, equals 24. We can start by multiplying both sides of the equation by 8:

____ - 56 = 24•8

Simplifying, we get:

____ - 56 = 192

Adding 56 to both sides of the equation, we get:

____ = 192 + 56

____ = 248

So the missing number is 248.