With calculators in every pocket, why bother training mental arithmetic? The answer goes deeper than just exam rules — it shapes how students think.
Parents sometimes ask us: if kids will always have access to calculators, why are we spending time on mental maths? It's a fair question — and the answer is more important than most people expect.
Mental maths builds number sense. When students can estimate answers and check whether a result is reasonable, they catch errors that calculators never will. A student who blindly types 3.5 × 20 and reads back "700" won't notice something's wrong unless they have an instinct for what the answer should be.
It trains working memory. Holding intermediate steps in mind while solving a problem is exactly what working memory does — and it's the same cognitive muscle used in reading comprehension, science reasoning, and essay writing. Mental maths is essentially a workout for the brain.
Exam conditions demand it. In the VIC and NSW Selective Entry exams, the Scholarship exam, and many NAPLAN sections, calculators are not permitted. Students who haven't trained their mental arithmetic arrive at these exams without one of their most important tools.
Speed creates confidence. When basic operations are automatic, students can direct their full attention to the harder reasoning in a problem. Slow arithmetic is a bottleneck — it drains mental energy and increases anxiety.
At The Online Kids, our Speed Maths Program uses techniques from Vedic, Chinese, Arabic, and Japanese traditions to make arithmetic fast and intuitive. Students in the program regularly cut their working time in half within the first term — not by working harder, but by working smarter.