Maths Challenge - Maths Challenge 1 - Addition and subtraction of the number 9 - 主播大秀 Sounds

Maths Challenge - Maths Challenge 1 - Addition and subtraction of the number 9 - 主播大秀 Sounds


Maths Challenge 1

Addition and subtraction of the number 9

Ralph van Dijk has the questions and the subject of today's quiz is the addition and subtraction of the number 9.

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