1022
google search
Google search results:
1: https://web.lemoyne.edu/courseinformation/mth%20112/rinaman/instman/SOLUTION.PDF
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2: https://www.toppr.com/guides/reasoning-ability/analogy/number-analogy/
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3: https://www.parker.com/Literature/O-Ring%20Division%20Literature/ORD%205700.pdf
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4: https://louisianabelieves.com/docs/default-source/assessment/grade-4-math-answer-key.pdf?sfvrsn=ce2f9b1f_2
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5: https://arxiv.org/pdf/math/0001012
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6: https://arxiv.org/pdf/1302.1479
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7: https://en.wikipedia.org/wiki/Table_of_prime_factors
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8: https://sharylandisd.org/common/pages/UserFile.aspx?fileId=2569918
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9: https://hchs.henryk12.net/ourpages/auto/2017/8/23/57395227/501MathWordProblems3rdEdition%20_1_.PDF
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10: https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-subtracting-with-regrouping-within-1000/v/regrouping-twice-when-subtracting-three-digit-numbers
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11: https://books.google.com/books?id=pQE1PqK0HtUC&pg=PT2&lpg=PT2&dq=O+169%0AFill+the+following+Series%0A521%0A65%0A128+?%0A350%0AO+221%0AO+216%0AO+225&source=bl&ots=3E_XY7IjKJ&sig=ACfU3U1hLpqkzVmPg16AygXeNWRZ6qo1YQ&hl=en&sa=X&ved=2ahUKEwihhp7Q1bLzAhWZJjQIHa3qCcsQ6AF6BAgVEAM
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