Practice visualizing numbers and patterns with the Color-Changing Abacus! This engaging, one-of-a kind math tool helps children progress from developing one-to-one correspondence skills to mastering subtraction and place value. The unique color-changing beads allow little learners to see and feel number patterns, deepening their understanding of complex math concepts. Click the link to shop! bit.ly/amzncolorchangingabacus | Hand2mind | Facebook

1M views · 2.7K reactions | A video of primary school students doing complex finger calculations at a mental abacus competition in Lanzhou has been receiving attention on Chinese social media. | Sixth Tone | Facebook