Q: My son has easily memorized the 2’s, 3’s and 5’s in multiplication. The others are coming along very slowly. Are there any tricks to make learning these facts easier? — Multiplication Problems A: ...

THESE tables aim at popularising logarithms. Like other four-figure tables they give the logarithms of numbers from 1000 to 9999. While the ordinary tables give these in one opening of two pages by ...