About Rule of three tests Voice 3 languages
-With voice . 3 languages.
-Teaches simple rule of three. With voice and tests.
-Rule of three direct and inverse
-Revises the test with or without voice.
-On top of learning rule of 3 the student can learn some spanish and portuguese languages.
-Both written and spoken.
-Realistic voice, almost human.
-Also incorporates calculator.
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