Mathematics from zero
Numbers: free-recall review
Saying an answer from memory makes it stick far better than re-reading. For each prompt, say or write a full answer first — then open the model answer and check yourself.
Reconstruct the unit’s core ideas from memory — what counting really is, the three comparison results, place value, the job of zero, and the number line — without looking back at the lessons.
- 01What is counting, really, and why must each number word land on exactly one object?
- 02When you compare two whole numbers, what are the only possible results, and how does the number line decide?
- 03How do the greater-than and less-than signs work, and what is the trick for never flipping them?
- 04Explain place value: why is the digit 4 worth 40 in one number and only 4 in another?
- 05What job does the digit 0 do in a number like 305, and what changes if you remove it?
- 06What is a number line, and why must its gaps be equal?
If you could rebuild each answer from memory, you hold the spine of the unit: counting is matching one word to one object; comparing has exactly three results and the further-right number wins; the open side of the sign faces the bigger number; a digit’s value is the digit times its place; zero is the placeholder that keeps the others in place; and the number line ties it all together with equal gaps that turn counting into movement you can see.