Target 3: Multiplying/Dividing by 10, 100 & 1000

Multiplications and divisions of any number by 10, 100 or 1,000 should be performed mentally. If your students have a solid understanding of decimal place value (see the Target 2 workbook) then they will also appreciate how the digits ‘move’ with certain calculations.

In the Target 3 workbook, students will first learn to identify numbers with ‘useless zeros’ (those zeros that are often unnecessarily written at the end of decimal numbers). After this, it’s straight into the meat and bones of the workbook: multiplying any number by 10, then dividing any number by 10; followed by the same pattern for 100, then for 1,000. Each calculation is dealt with individually before mixing them together in a 40-question test.

Your pupils will also be challenged to select the largest or smallest decimal number from a list and perform one of Target 3’s calculations with it.

Finally, they will study what happens when two of these calculations are carried out with the same number, setting the stage for the Target 4 workbook. If a child can recognise what happens to a number when it is divided by 100 then multiplied by 10, they will be ready to answer questions such as 0.07x80.

Each Target Practice workbook is divided into ten challenges, with target scores and time limits. The Target Extra section at the back of each book contains several repeat challenges, enabling children to hit that target score should they miss out the first time.

This is a colourful 103-page PDF download, with explanation pages for each concept, and quick links to each chapter and the answer pages.

Not only that, this Target Practice workbook contains links to 64 minutes of teaching video, created by Catapult (only available to those who purchase the workbook).

Target 3’s ten steps are as follows:

Target 3a: Useless Zeros

Target 3b: Multiplying by 10

Target 3c: Dividing by 10

Target 3d: Multiplying by 100

Target 3e: Dividing by 100

Target 3f: Multiplying by 1,000

Target 3g: Dividing by 1,000

Target 3h: Putting it all Together

Target 3i: Comparing Decimals & Calculating

Target 3j: Two-Step Calculations

The concepts taught in Target 3 will lay the foundations for mental multiplications and divisions involving groups of tens, hundreds and thousands (as well as tenths, hundredths and thousandths): 40x60, 70x0.03, 360÷90 and so on. This will be the theme of the Target 4 workbook.

Launch their potential.

Trevor Veale

Target Practice author

Owner and full-time tutor at Catapult

Primary school teacher for nine years