ISEE Lower Level Math : How to add

Study concepts, example questions & explanations for ISEE Lower Level Math

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Example Questions

Example Question #51 : How To Add

Evaluate the Following Expression

\(\displaystyle 2 + 3 + 15\)

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 10\)

\(\displaystyle 25\)

\(\displaystyle 17\)

\(\displaystyle 30\)

Correct answer:

\(\displaystyle 20\)

Explanation:

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

\(\displaystyle 2 + 3 + 15\)

\(\displaystyle 2 + 3 = 5\)

\(\displaystyle 5 + 15 = 20\)

Example Question #52 : How To Add

Evaluate the Following Expression

\(\displaystyle 4 + 8 + 13\)

Possible Answers:

\(\displaystyle 30\)

\(\displaystyle 25\)

\(\displaystyle 35\)

\(\displaystyle 15\)

\(\displaystyle 20\)

Correct answer:

\(\displaystyle 25\)

Explanation:

If you’re having trouble, follow the following steps.

First, take the first two numbers and add them together.

Then, take the sum from the operation above and add it to the third number.

You can repeat this process (i.e. only adding two numbers at a time, and then adding the next number to the sum) as many times as is necessary.

\(\displaystyle 4 + 8 + 13\)

\(\displaystyle 4 + 8 = 12\)

\(\displaystyle 12 + 13 = 25\)

Example Question #53 : How To Add

\(\displaystyle 64+27=?\)

Possible Answers:

\(\displaystyle 77\)

\(\displaystyle 71\)

\(\displaystyle 90\)

\(\displaystyle 84\)

\(\displaystyle 91\)

Correct answer:

\(\displaystyle 91\)

Explanation:

To add these two numbers, first add the values in the one's places, 

\(\displaystyle 4+7=11\).  

Then add the numbers in the ten's places, 

\(\displaystyle 60+20=80\).  

Then put the two values together to get \(\displaystyle 91\).

Example Question #54 : How To Add

\(\displaystyle 15+6=?\)

Possible Answers:

\(\displaystyle 2.5\)

\(\displaystyle 75\)

\(\displaystyle 90\)

\(\displaystyle 21\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 21\)

Explanation:

First you add the ones places together 

\(\displaystyle (5+6=11)\).  

Then you add the \(\displaystyle 10\) to that to get 

\(\displaystyle 11+10=21\).

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