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primary 5 | Maths | Whole Numbers
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primary 5 chevron_right Maths chevron_right Whole Numbers

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Date Posted: 2 years ago
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Tan AiLing Luanne
Tan Ailing Luanne's answer
31 answers (Tutor Details)
Use the formula: n/2 (a+l), where n is the number of numbers, a is the value of the first number and l is the last digit.
For eg, if the qn is 2+4+6, n will be 3, a is 2 and l is 6. So sum is 3/2 (2+6) = 12.