Hands-on / kinesthetic approach
Use physical, large-scale representations so that abstract number relationships become bodily and visual. Each activity gives students something to move, build or hold.
Human number line. Lay a rope along the floor with a "0" card in the middle. Students hold integer cards and stand in position; the class checks the order by walking the line from left to right.
Counter arrays for primes. Students build rectangles with tiles. If a number can only form a single row, it is prime — the "stuck in one line" feeling is memorable and concrete.
Percentage washing line. Peg fraction, decimal and percentage cards onto a string stretched across the room so equivalent values hang together.
Place-value flip. Use a sliding place-value chart; physically slide each digit one column left when multiplying by 10, and one column right when dividing.
These activities suit kinesthetic and visual learners and give the teacher a fast read of the whole class — misplacements on the human number line are visible at a glance.