D = 8cm H=8cm - Gauthmath

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Question

ANNUAL MATHLYMPICS FOR ALL SINGAPORE PRIMARY SCHOOLS  Section A  Each of the questions 1 to 10 carries 2 marks.  1. The sum of 9 out of 10 consecutive numbers is 2018. Which number is left out?SHOW LESS0

Solution

Answer: The number left out is 200.

Step 1: Find the sum of 10 consecutive numbers using the formula: Sum = (n/2)(2a + (n-1)d), where n = 10, sum = 2018. Step 2: Substitute the values into the formula: 2018 = (10/2)(2a + 9d). Step 3: Simplify the equation: 2018 = 5(2a + 9d) = 10a + 45d. Step 4: Since the sum of 9 numbers is 2018, subtract the 10th number from the total sum to find the missing number. Step 5: Calculate the missing number: 2018 - (10a + 45d).

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