To split a whole up into parts; a piece or section of a whole.

Add 2-digit numbers when crossing the tens boundary

Maths

In this unit pupils will learn to find 10 more or less than a 2-digit number. They will  add and subtract 10 to/from a 2-digit number using number facts. In the future unit pupils will add 3 addends, understanding they can be added in any order, bridging through 10.

In the prior unit pupils added and subtracted 1s and 10s from 2 digit numbers. They used number facts to add/subtract a single-digit number to/from a 2-digit number and used a part-part-whole model to represent addition and subtraction. In this unit pupils will learn to find 10 more or less than a 2-digit number. They will  add and subtract 10 to/from a 2-digit number using number facts.

Addition and subtraction of two 2-digit numbers

Partition both addends to solve the equation. 57 + 34 = {{ }}

Which equation is represented by this number line?

Which of the following is the missing addend? 35 + {{   }} = 71

Find the missing addend. 38 + {{   }} = 63

Which of the following is the missing addend?

Use the first equation to help solve the second equation.

Which of the following could be the ones digits in the equation?

One of the Base 10 blocks has been moved over from one addend to the other. Which of the following could show the new equation? Tick two.

This lesson will soon be taken down.

Add 2-digit numbers when crossing the tens boundary

Lesson outcome