We can create number 100 by using all numbers, i.e.0123456789 and mathematical operators (+/-) in many ways.
Example
98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100
But if we add a condition that the use of the number 21 is the must. Then there are only a few solutions.
One of such solution is:
98 - 7 - 6 - 5 - 4 + 3 + 21 = 100
Can you tell any other solution?
Pick:
A) 7 - 8 + 76 - 5 + 4 + 3 + 21 = 100  B) 8 - 8 + 76 - 5 + 4 + 3 + 21 = 100  C) 9 - 8 + 76 - 5 + 4 + 3 + 21 = 100  D) None of these  E) Cannot be determined
Solution:   9 - 8 + 76 - 5 + 4 + 3 + 21= 
<gadget id="calculator">9 - 8 + 76 - 5 + 4 + 3 + 21</gadget>
<output>100</output>
100   Other ways of making number 100 (withiout using number 32)   98 + 7 + 6 - 5 - 4 - 3 + 2 - 1= 
<gadget id="calculator">98 + 7 + 6 - 5 - 4 - 3 + 2 - 1</gadget>
<output>100</output>
100   98 - 7 - 6 - 5 - 4 + 3 + 21= 
<gadget id="calculator">98 - 7 - 6 - 5 - 4 + 3 + 21</gadget>
<output>100</output>
100   9 - 8 + 76 - 5 + 4 + 3 + 21= 
<gadget id="calculator">9 - 8 + 76 - 5 + 4 + 3 + 21</gadget>
<output>100</output>
100   98 - 7 + 6 + 5 + 4 - 3 - 2 - 1= 
<gadget id="calculator">98 - 7 + 6 + 5 + 4 - 3 - 2 - 1</gadget>
<output>100</output>
100   98 + 7 - 6 + 5 - 4 + 3 - 2 - 1= 
<gadget id="calculator">98 + 7 - 6 + 5 - 4 + 3 - 2 - 1</gadget>
<output>100</output>
100   98 + 7 - 6 + 5 - 4 - 3 + 2 + 1= 
<gadget id="calculator">98 + 7 - 6 + 5 - 4 - 3 + 2 + 1</gadget>
<output>100</output>
100   98 - 7 + 6 + 5 - 4 + 3 - 2 + 1= 
<gadget id="calculator">98 - 7 + 6 + 5 - 4 + 3 - 2 + 1</gadget>
<output>100</output>
100   98 - 7 + 6 - 5 + 4 + 3 + 2 - 1= 
<gadget id="calculator">98 - 7 + 6 - 5 + 4 + 3 + 2 - 1</gadget>
<output>100</output>
100   98 + 7 - 6 - 5 + 4 + 3 - 2 + 1= 
<gadget id="calculator">98 + 7 - 6 - 5 + 4 + 3 - 2 + 1</gadget>
<output>100</output>
100   98 - 7 - 6 + 5 + 4 + 3 + 2 + 1= 
<gadget id="calculator">98 - 7 - 6 + 5 + 4 + 3 + 2 + 1</gadget>
<output>100</output>
100   9 + 8 + 76 + 5 + 4 - 3 + 2 - 1= 
<gadget id="calculator">9 + 8 + 76 + 5 + 4 - 3 + 2 - 1</gadget>
<output>100</output>
100   9 + 8 + 76 + 5 - 4 + 3 + 2 + 1= 
<gadget id="calculator">9 + 8 + 76 + 5 - 4 + 3 + 2 + 1</gadget>
<output>100</output>
100   Answer  9 - 8 + 76 - 5 + 4 + 3 + 21= 
<gadget id="calculator"> 9 - 8 + 76 - 5 + 4 + 3 + 21</gadget>
<output>100</output>
100
<result>C</result>
We can create number 100 by using all numbers, i.e.0123456789 and mathematical operators (+/-) in many ways.
Example
98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100
But if we add a condition that the use of the number 21 is the must. Then there are only a few solutions.
One of such solution is:
98 - 7 - 6 - 5 - 4 + 3 + 21 = 100
Can you tell any other solution?