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a b 0 Let a b be an unknown two digit number. a is in 10’s position and b is in 1’s position a b 1 1 a b a a+b b Multiplication of a two-digit number 11 +

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+ a b 0 a b 1 1 a b a a+b b a b ba+ba Paper & pencilMental math

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Multiplication of a two-digit number 11 a b ba+ba Mental math 6 2 11 = 6 8 2

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Multiplication of a two-digit number 11 a b ba+ba Mental math 6 2 11 = 682 3 9 11 = 1212 93

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Multiplication of a two-digit number 11 a b ba+ba Mental math 6 2 11 = 682 3 9 11 = 3 9 12 4 2 9

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Multiplication of a two-digit number 11 a b ba+ba Mental math 6 2 11 = 682 3 9 11 = 429

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MENTAL MATH Adding Facts to 5 1 + 1 = 2 - 1 = 1 + 2 =

MENTAL MATH Adding Facts to 5 1 + 1 = 2 - 1 = 1 + 2 =

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