A 2-digit number refers to a value between 10 and 99. The number is made up of two digits which represent tens and ones.

Use known facts to find pairs of numbers that total 100

Maths

Composition of 100 in 10s and 1s

Composition of 100 in 50s, 25s and 20s

Multiples of 10 that total 100

Use known facts to find complements to 100 efficiently

Represent 3-digit multiples of 10 in different ways

Use place value knowledge to write addition and subtraction equations

Bridge 100 by adding in multiples of 10

Bridge 100 by subtracting in multiples of 10

Solve problems using knowledge of addition and subtraction of multiples of 10

In this unit pupils will use known facts to find multiples of ten that compose 100  and use known facts to find complements to 100.  In the future unit pupils will find a 2-digit number and a 1 or 2-digit number that compose 100. Pupils will position 3-digit numbers on a number line and estimate the position of 3-digit numbers on unmarked number lines. They will compare and order 3 digit numbers.

In the prior unit pupils reviewed and secured previous knowledge of add 3 addends, understanding they can be added in any order, bridging through 10. In this unit pupils will use known facts to find multiples of ten that compose 100  and use known facts to find complements to 100.

In this unit pupils will use known facts to find multiples of ten that compose 100 and use known facts to find complements to 100. They will add and subtract multiples of ten, bridging 100.

Securing place value to 100 and applying to addition and subtraction

Which of these 2-digit numbers is a multiple of ten?

What is 100 subtract 6? Use the number square.

Two 2-digit numbers total 100. If the first number has 10 ones, the second number is ...

No, because the one digits do not total 10

No, because the tens digits do not total 90

100 is composed of 7 tens and {{ }} tens.

If I know that 2 + 8 = 10 what else do I know?

Izzy was running 100 m. She fell over at 60 m. How many more metres did she have to run?

Use known facts to find pairs of numbers that total 100

Lesson outcome