How many sweets in the jar? Beans in the bowl? Books on that shelf? Estimation is the bridge between guessing and measuring.
Strategy: divide and conquer
Estimate one row, count rows. Estimate one shelf, count shelves. Multiply. You're using multiplication to scale up a small careful count into a big confident answer.
You try
A jar holds 12 sweets per layer and looks 8 layers deep. Estimate the total.
Always overestimate empty space. Real jars have gaps near the edges, so 8 × 12 might really be 90, not 96.