Question
Find the sum of 28 and 36 using mental math.
- 58
- 60
- 64
- 68
Hint:
An addition mental math technique is to dissect an addend. This approach might be more effective for some students than left-to-right addition. This method involves dividing up one addend in an equation into more manageable bits. Here we have given to find the sum of 28 and 36 using mental math. So we will break the number in an appropriate way and then show the sum.
The correct answer is: 64
Now as we know that here we have to find the step by breaking one number. The fact that there are no steps to memorise is one of the best things about mental math. The "friendly number" addition approach facilitates working with large numbers. This is due to the fact that we are, in essence, decomposing the problem into more manageable components.
Friendly numbers are multiples of 10 like 20, 30, 40 which makes the calculations easy. Here we will use the same and then find the step.
Now we have given 28 + 36, lets solve this.
We will break 36 to 30 and 6 first.
28 + 36
28 + 30 + 6
Now adding 28 and 30, and breaking 6 in 2 and 4.
58 + 2 + 4
Now adding 58 and 2.
60 + 4
Finally adding the terms, we get:
64.
So, the sum of 28 and 36 is 64.
Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 28 + 36 mentally is 64.
Related Questions to study
Find the number that makes the equation true.
18 + 32 = ⎕
Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 18 + 32 mentally is 50.
Find the number that makes the equation true.
18 + 32 = ⎕
Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 18 + 32 mentally is 50.
Find the second addend of 34 to make a 10.
Then, the second addend will becomes 6 by adding 4 gives 10.
Find the second addend of 34 to make a 10.
Then, the second addend will becomes 6 by adding 4 gives 10.
Which is not the correct step for finding the sum of 34 and 16.
Here the concept of Break Apart Numbers is used where a number is divided into two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first incorrect step for finding the sum of 34 and 16 mentally is 34 + 7 + 11.
Which is not the correct step for finding the sum of 34 and 16.
Here the concept of Break Apart Numbers is used where a number is divided into two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first incorrect step for finding the sum of 34 and 16 mentally is 34 + 7 + 11.
Find the number that makes the equation true.
23 + 7 = ⎕
Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 28 + 36 mentally is 30.
Find the number that makes the equation true.
23 + 7 = ⎕
Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 28 + 36 mentally is 30.
With the help of the image find the sum.
>>> Tens: 60 + 20 = 80
>>> Ones: 2 + 4 = 6
>>> Sum: 80 + 6 = 86
With the help of the image find the sum.
>>> Tens: 60 + 20 = 80
>>> Ones: 2 + 4 = 6
>>> Sum: 80 + 6 = 86
Find the missing ones or tens digits.
15 + 59 = ⎕4
15 + 59 = 74.
Find the missing ones or tens digits.
15 + 59 = ⎕4
15 + 59 = 74.
With the help of the image find the sum.
Tens: 30 + 10 = 40
Ones: 4 + 9 = 13
Sum: 40 + 13 = 53
With the help of the image find the sum.
Tens: 30 + 10 = 40
Ones: 4 + 9 = 13
Sum: 40 + 13 = 53
Find 34 + 49.
*** So, 34 + 49 = 83
Find 34 + 49.
*** So, 34 + 49 = 83
Find the missing ones or tens digits.
17 + 45 = 6⎕
>>> 17 + 45 = 62.
Find the missing ones or tens digits.
17 + 45 = 6⎕
>>> 17 + 45 = 62.
Find the missing number.
Since, the partial division of a number gives ones same as the digit in the one's place.
>>> 82 -> 80 + 2.
Find the missing number.
Since, the partial division of a number gives ones same as the digit in the one's place.
>>> 82 -> 80 + 2.
Find the partial sums:
Tens = 30 + 20 = 50
Ones = 5 + 4 = 9
Find the partial sums:
Tens = 30 + 20 = 50
Ones = 5 + 4 = 9
Find the partial sum of the given place value block.
>>> Tens: 10 + 20 = 30
>>> Ones: 5 + 6 = 11
Find the partial sum of the given place value block.
>>> Tens: 10 + 20 = 30
>>> Ones: 5 + 6 = 11
Find the missing number.
24 - 4 = 20
Find the missing number.
24 - 4 = 20
Find the partial sum of the given place value block.
>>> Tens: 30 + 20 = 50
>>> Ones: 7 + 2 = 9
Find the partial sum of the given place value block.
>>> Tens: 30 + 20 = 50
>>> Ones: 7 + 2 = 9
