Thousands, Angles and Time

The Thousand Cube #

Ten hundreds stacked into one block.

Ten hundreds stack into a single block, and that block is a thousand

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This flat square is one hundred. Stack 10 of them and watch what they build.

Ten hundreds stacked up make a solid thousand: 10 × 100 = 1000.

Thousands, hundreds, tens and ones. Every digit counts its own group.

Numbers to Ten Million #

Eight digits, read in groups of three.

The places keep growing tenfold, and the comma groups them three at a time

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Ten thousand-blocks make ten thousand. Ten of those make a hundred thousand.

Big numbers group three digits at a time: 342,516 is 342 thousands and 516.

Read the front group, say thousand at the comma, then read the back group.

A second comma marks millions: 4,250,000 reads four million, two hundred fifty thousand.

Angles #

How far one line has turned from another.

An angle measures how far one line has turned away from another

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A quarter turn is a right angle, 90°. Turn the arm until the little square appears.

Turn less than 90° and the angle is acute.

Turn past 90° and the angle is obtuse.

Measuring and Drawing Angles #

Read the protractor from the zero the arm sits on.

An angle is read off the protractor, starting from the zero its arm sits on

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The angle at B, between arms BA and BC, is written ∠ABC — the vertex in the middle.

Center on the vertex, zero along one arm: the other arm crosses the scale at 50.

Both rings mark this arm: 130 and 50. Start from the arm on zero — it is 130.

Telling the Time #

Two hands, two speeds, two meanings.

The short hand names the hour; the long hand counts the minutes in fives

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The short hand names the hour — it points at 3. The long hand counts minutes.

The long hand counts in fives: every numeral is 5 minutes. On the 3, that is 15.

On the 6 it has counted six fives — 30 minutes. Half past three.

At 3:45 the short hand has crept near the 4 — the hour stays 3 until it passes 12.

Telling Time to the Minute #

Fives to the numeral, then the single marks.

Count fives to the numeral, then single marks the rest of the way

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The long hand sits past the 4: fives make 20, then 2 small marks — 22 minutes.

Just past the hour: 3 small marks — 10:03, the minutes written with a zero.

Hours and Minutes #

Sixty minutes to the hour, written h and min.

An hour is 60 minutes, written h and min

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From 3:00 to 4:00 is one hour, and one hour is 60 minutes.

Hour shortens to h and minute to min: 1 h = 60 min, 2 h = 120 min.

Half an hour is 30 min — the long hand has gone half the way round.

Minutes and Seconds #

Sixty seconds to the minute, written s.

A minute is 60 seconds, written s

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Seconds count the quick things, and sixty of them make a minute: 1 min = 60 s.

A blink takes a second and a song takes minutes — the unit matches the doing.