3rd grade (Unit 5) - MathsOnline version 3rd grade (Unit 5) - Maths by Oscar Del Estal Martínez 1 Correct 2 Incorrect six + four = ten twenty-three - seven = sixteen four + twenty-one = twenty-five seventeen - six = eleven twelve + twenty = thirty-two forty - fifteen = twenty-five seven + fourteen = twenty-two thirty-five - six = thirty-nine fifty - fifteen = zero eleven + twenty-nine = fifty twenty-one - six = sixteen seventeen + six = twenty-four
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