// Numbas version: finer_feedback_settings {"name": "Multiply any number by 11", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Multiply any number by 11", "tags": [], "metadata": {"description": "

quick shortcut

", "licence": "Creative Commons Attribution-NonCommercial 4.0 International"}, "statement": "

Complete this problem

", "advice": "

Shortcut is to place first and last digits spaced out and to add together each pair of numbers in between.  If you sum has 2 digits, write the last digit but add the first digit to the sum of the numbers before it 

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PATTERN: abcd

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write a     d

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add c+d and place answer in front of  d: a  (c+d) d

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add b+c and place answerin front of (c+d): a (b+c) (c+d)  d

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add a+b and place answer in front of (b+c): a (a+d) (b+c) (c+d)  d

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Answer is a (a+d) (b+c) (c+d)  d

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example

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1234

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1   4

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3+4=7

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2+3=5

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1+2=3

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ANSWER = 13574

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any 4 digit number

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{a} x 11

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