Class 2 number sense: counting, comparing and ordering to 1000
Number sense is the quiet foundation under everything else in Class 2 maths. Before a child can add, subtract or solve a word problem, they need to feel comfortable with what a number actually means — how big it is, what it is made of, and where it sits next to other numbers.
Many children can chant "one, two, three" long before they truly understand that the 4 in 463 is worth four hundred, not four. That gap is where confidence wobbles later. This topic builds the understanding first, so the arithmetic that follows has something solid to stand on.
What your child needs to know
- Read, write and count numbers up to 1000
- Understand place value — hundreds, tens and ones
- Compare two numbers and say which is greater or smaller
- Put a set of numbers in order, smallest to largest
- Find the number just before, just after and between others
- Skip count in twos, fives and tens
Worked examples
Which is greater, 472 or 427?
Hint — compare the hundreds first, then the tens.
Both numbers have 4 hundreds, so we look at the tens. 472 has 7 tens; 427 has 2 tens. Since 7 tens is more than 2 tens, 472 is greater than 427.
What is the value of the 6 in 361?
Hint — which column is the 6 sitting in?
In 361 there are 3 hundreds, 6 tens and 1 one. The 6 is in the tens column, so its value is 6 tens, which is 60 — not 6.
Write 508 in expanded form.
Hint — break it into hundreds, tens and ones.
508 is 5 hundreds, 0 tens and 8 ones. So 508 = 500 + 0 + 8, which we usually write as 500 + 8. The zero is doing an important job: it holds the tens place empty.
Put these in order, smallest first: 199, 91, 190.
Hint — count the hundreds in each number first.
91 has no hundreds (it is a two-digit number), so it is the smallest. Both 190 and 199 have 1 hundred and 9 tens, so we compare the ones: 0 is less than 9. The order is 91, 190, 199.
How Olympiads test this
At Class 2 level, Olympiads such as SOF IMO and CREST CMO lean heavily on place value and on "which is greatest / least" questions, often wrapped in a picture — numbers on jerseys, houses or animals. You may also see before / after / between items set on a number line. The dressing changes; the skill being checked is always reading a number and comparing it. Practising comparison and ordering calmly is the best preparation — never a prediction of the exact questions that will appear.
Practice questions
Show 5 practice questions and answers
- Which is smaller, 305 or 350? — 305
- What is the value of the 4 in 407? — 4 hundreds, which is 400
- What number comes just after 699? — 700
- Skip count in fives: 15, 20, 25, ___ — 30
- Order these smallest to largest: 88, 808, 80. — 80, 88, 808
Free lesson: odd and even numbers
Odd and even numbers are one of the first number-sense skills a child meets. Our free lesson shows the one-second trick — read the odd and even numbers lesson, with worked examples and practice you can do together.
Inside Talyzo: World 1, Plants & Animals
In the Talyzo course, number sense is World 1 — set in a world of plants and animals, where counting creatures and comparing groups makes big numbers feel friendly. Every question comes with a hint before the answer and a full explanation after, exactly like the examples above. You can try it in the free first chapter.
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