Crossing the Decades Concentration

Last week we discussed the difficulties many students experience when beginning to explore larger numbers and the problems associated with 'crossing the decades' - moving from a digit ending in 9 to the next ten.

This week we have added a 'Crossing the Decades Concentration' game to our store to assist students to develop and practise this skill.

 

Crossing the Decades Concentration cards help students practise this concept while playing a game. Cards include all pairs of 9 to 10 numbers up to 100 in 3 formats - digits, number names and pictures.

 

Teachers can select the cards that are appropriate for use with the students they are working with. Cards may be selected to include a specific number range (e.g. cards between 9 and 20) or particular sets of cards to make the task simpler or more challenging (e.g. digits and picture cards, digits and number names or number names and picture cards). Students look for the correctly sequenced numbers and find a ‘Crossing the Decades’ pair. For example: 29 and 30 or 69 and 70. Cards can be selected so that students match digits with digits or can be selected so that any combination is acceptable as a pair.

 

 

The cards can be printed in colour or black and white, and then laminated for long term use. Cut along the dotted lines to create 6 individual cards per page.

 

We hope this helps your students to develop the skills to successfully 'cross the decades'!

 

Crossing the Decades

As students develop their ability to count, a common problem often occurs when they begin to explore numbers that 'cross the decades'. This refers to moving from a digit ending in a 9 to the next group of 10. For example: 29 to 30 or 79 to 80. 

 

When counting, students can struggle to identify the next number in the sequence, not know what number comes next or select a random number that they think might work!

 

There are lots of counting and place value games that support students to build their skills in this area. The use of 10s frames and counting charts are a great place to start, along with bead frames in groups of 10.

 

Next week we will be publishing a concentration game that can be used to support students to learn and practise these counting sequences. This game will include concentration cards in 3 different formats: written numerals, digits and a number representation (10s frames for smaller numbers & base 10 blocks for larger numbers).

 

 

 

If you have any great tips for supporting students to successfully 'cross the decades', please feel free to leave a comment or let us know at kpisurf@gmail.com.

 

Adding 1 can be tricky

Click here or the images for more detail

Adding 1 to a collection can be hard for some kids as they need to go back to the start and count form one.

Subitising is a pre requisite that is needed to do this task. 

Do lots of trusting the count before you add one. 

This pack will help to see a collection and then add 1.

iSURF© is a mathematical structure that will support AusVELS and the Australian Curriculum, as well as the CCSS in the USA  - 36 pages

You will find.....

Poster - I can add 1 to a collection

Peg It - Adding a collection and clip with a peg

Spin and add 1 - Laminate and add the spinner with a split pin. Spin and add one. Some students may be ready to record the equation

Read the Room - Adding 1, there are two sets. Color copy and laminate – then display around the room. Students then locate the cards and record the answers. Set 1 is to 10 - children identify the sea animal and record the answer next to it. Set 2 is to 20 and is labelled alphabetically

Roll the Dice - There are recording sheets for 6, 10 and 12 sided dice. Each child needs a best fit dice. They roll the dice and then record the answer vertically and horizontally.

                                       

CCSS standards are included 

K.CC.A.2 Counting and Cardinality – know number names and the count sequence. Count forward beginning from a given number within the known sequence (instead of beginning at 1)

This task fits in with the following

AusVELS Content Description:  

Establish understanding of the language and processes of counting by naming numbers in sequences, initially to and from 20, moving from any starting point (ACMNA001)

Represent practical situations to model addition and sharing (ACMNA004)