Primary 2 Mathematics revision reference

Find a fact or word here. Open a lesson when you want to see it with objects or pictures.

Hundreds, tens and ones

1 hundred = 10 tens = 100 ones.
306 is 3 hundreds, no tens and 6 ones: three hundred and six.
Compare hundreds first, then tens, then ones.
An even number can be put into pairs with none left. An odd number leaves one.

When you add or subtract in columns, keep ones below ones, tens below tens and hundreds below hundreds. Exchange a ten for 10 ones when needed.

Use the 2, 3, 4, 5 and 10 times tables, up to 10 groups.

÷ means divide. A multiplication fact helps you check a division fact. Dividing by zero has no answer.

A fraction uses equal parts of the same whole. In 3/4, the 4 says there are 4 equal parts in a whole; the 3 counts 3 of them.

A unit fraction has 1 on top, such as 1/2 or 1/5.
Like fractions have the same number on the bottom.
For the same whole, 1/2 is bigger than 1/4: 2 equal pieces are larger than 4 equal pieces.
With like fractions, count the parts: 1/5 + 2/5 = 3/5. Keep the 5 on the bottom.

This course compares fractions with denominators up to 12 and adds or subtracts like fractions within one whole.

1 dollar = 100 cents. An amount written $2.05 means 2 dollars and 5 cents, or 205 cents.
m means metres; g means grams; kg means kilograms; ℓ means litres.
Compare lengths with lengths, masses with masses and liquid volumes with liquid volumes. Use the same unit.
1 hour = 60 minutes. 1 hour 20 minutes is 80 minutes.
On a clock, a small minute gap is 1 minute. Read both hands.

Cube, cuboid, cone, cylinder and sphere name solid shapes. A solid is not the same thing as one of its flat faces.

In a repeating shape pattern, find the smallest block that repeats. Check shape, size, colour and which way each shape faces.

In a scaled picture graph, read the key first. If one picture stands for 2 children, 3 pictures stand for 6 children.