Use known facts to find complements to 100 efficiently

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 pairs of numbers that total 100

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

Complete the sentence: When the ones digits total 10 and the tens digits total {{ }} the two 2-digit numbers are complements to 100

55 + 55 = 100. Why is this calculation incorrect?

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

Jacob has 75 football cards and wants 100 football cards. How many more football cards does he need?

Use known facts to find complements to 100 efficiently

Lesson outcome