Subtraction by bridging through 10s up to 100

Bridging through 10 is a mental math technique used when a subtraction means 'breaking through' a multiple of 10 to get to the final answer. e.g. 23 - 7 = 16. This example bridges through 20.

The process of bridging divides the subtraction into 3 simple steps each of which can be handled mentally in order to get to the final answer 

This resource has 2 parts

1. Almost Unlimited Worksheets

Worksheet Set 1

Subtracting 1 digit numbers to 2 digit numbers, bridging up to 100  with visual support

Worksheet Set 2 

Pupils have the opportunity to practice this topic further either by using the visual method from Worksheet Set 1 or using their own graphics that support the concept of bridging.

Almost Unlimited Worksheets ?

At the click of a button all numbers are randomised, so the questions change each time.  This means you can create as many new worksheets you will need for practice throughout the year (classwork, homework, revision, fillers etc) or even give small groups of students in your class different sets of questions either at the same level or differentiated. There will certainly be enough to ensure fluency in this topic. 

As these worksheets  need little explanation and no preparation, they are ideal if you need to leave work for a replacement teacher.

Answers can be found on the second page of every worksheet, are automatically generated when you create a new worksheet.

2. Self Checking Interactive Presentation

Ideal for a whole class activity as an introduction to the worksheets, pupils can come to the Whiteboard and enter solutions and get immediate feedback. Examples are randomly generated, as with the worksheets, so you can use this one page as many times as needed until you feel confident your pupils are ready to start the worksheets.

There is also the option to take the pupils through the process in 3 separate steps, one at a time.

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Note

These resources work with the official  Adobe Acrobat Reader on Windows or Mac computers.

CCSS2.NBT.B.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.