A rectangular region of tissue is 6.0 × 10-4 m long and 2.0 × 10-4 m wide.
Each cell occupies a rectangle 30 μm30\,\mu\mathrm{m}30μm long and 20 μm20\,\mu\mathrm{m}20μm wide. The cells form a single layer with no gaps or overlaps.
How many cells fit in the region?
3.0×1013.0\times10^{1}3.0×101
2.0×1012.0\times10^{1}2.0×101
2.0×1022.0\times10^{2}2.0×102
4.0×1024.0\times10^{2}4.0×102
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.