The Print ShopParts of a number
Two-place decimals stacked in columns so the points sit under one another, added and taken away, twelve to a page. Every value prints to the same number of places, which is what makes the column line up.
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Work out each answer. Keep the points under one another.
Work out each answer. Keep the points under one another.
Lining up the decimal points is the whole lesson, and it is why these are stacked rather than written along a line. A child adding 4.70 and 12.05 as though they were 470 and 1205 gets the digits right and the answer ten times too big, and a page where the points are already in a column makes that mistake visible rather than mysterious.
Nothing here was worked out in floating point. 0.1 + 0.2 is not 0.3 in a computer, and a worksheet generator that adds decimals the obvious way prints an answer key with 0.30000000000000004 in it — or, worse, silently rounds and prints a key that is wrong in the last place. These sums are done in whole hundredths and the point is put back at the end.
The answers were worked out when the problems were, so the key is the same page with the answers drawn in rather than a second attempt at the same questions — there is no way for the two to disagree. The number in the footer is the seed the sheet was built from: it is printed so that the identical sheet can be had again next week, rather than one that merely looks like it.
This page is one sheet out of a family that can print thousands, and the settings behind it — how many problems, how big the numbers get, how they are laid out, whether there is room to work — are all switches. The builder link at the top of the page carries this sheet’s own settings, so the bench opens on exactly the sheet here rather than on a blank one.
The configuration travels in the address bar rather than on a server, so the link can be bookmarked or sent to somebody as it stands — and what they open is this sheet, down to the seed, rather than another one like it.
Not in the games. The number bonds under a decimal column are, in The Grid.
42 topics, each one a page like this one — the sheet, its answer key, and no account to print either.
The facts underneath everything else, and the columns after them.
Multiplication and division, from the twelve tables to the bracket.
Fractions, decimals, percentages and money — one idea, four ways.
Clocks, units and shapes: the math that is about something.
Signs, letters standing for numbers, and what a set is doing.
