The purpose of this unit is to develop knowledge and understanding of place value in three digit numbers. It is also to enable students to generalise from known two-digit facts, apply patterns associated with these to three digit numbers to 999, and to introduce 1000.
Specific Learning Outcomes
Description of Mathematics This unit of work follows Building with tens in which the place value structure of 2-digit numbers is explored. Students have been building their understanding of a group of ten objects as a unit and they are beginning to connect this idea to our numeration system. This developing place value understanding is generalised here to apply to all three-digit numbers and to 1000. As students work with a variety of place value materials, the connections between different representations should be clearly made, and the key ideas developed. Students begin by working with materials in which tens can be composed and decomposed with single units (eg. beans and containers) to using pre-grouped materials. Materials become increasingly abstract to the point where non -proportional models are used. The representation of a quantity by digits alone is in fact the most abstract. Here, the ability to competently use the same marker (digit) to represent different values, depends on the student having a sound conceptual understanding of the structure and patterns within our base ten system. One focus of this unit is on building the understanding of the ‘trend setting’ structure of hundreds, tens and ones. This grouping of hundreds, tens and ones is repeated in our numeration system, as the size of numbers increases or decreases. It is a fundamental building block and must be well understood if students are to work intuitively with big numbers and decimals. An introduction to the magnitude of growth or ‘powers of ten’ is essential. As students are beginning to understand the multiplicative nature of our number system, they benefit from seeing what ten times bigger looks like with each place shift to the left. ‘Knowing’ numbers and being able to quickly partition them in a variety of ways enables students to develop efficient strategies to problem solve. It is therefore important that students have opportunities to compose and decompose three digit numbers in a variety of ways, as these making and breaking experiences build deeper knowledge of the place value structure. Knowing numbers also involves the students developing some personal ‘benchmarks’ of size. Having a sense of the relative size of 200, 250, 500, 750, 800, for example, provides the student with useful reference points for problem solving. Maths language and communication skills continue to develop as students read, write and show three digit numbers, and talk about what they are doing. For example, using ‘ones’ or ‘units’ each time a number is described can be unnatural or awkward. Developing an implicit understanding that the 7 in ‘two hundreds, 3 tens and 7’ is 7 ones is useful. In these lessons mathematics communication is developed as students explain how they are using place value materials and the meaning they are making from them. Links to the Number FrameworkStages 5- 6
Opportunities for Adaptation and Differentiation The learning opportunities in this unit can be differentiated by providing or removing support to students and by varying the task requirements. Ways to differentiate the tasks include:
Using the place value language structure within te reo Māori to develop and reinforce a conceptual understanding of place value. This was introduced with teen numbers, numbers to 100, and continues to numbers greater than 100. For example:
In addition to supporting a conceptual understanding of the place value of numbers, the use of te reo supports the identity and language of Māori students.
Required Resource Materials
Select one or more activities from the several activities that are suggested for each session in this unit. Alternatively the activities suggested for each session could span multiple sessions. Many of the activities could also form the basis of independent practice tasks. Session 1SLOs:
Activity 1
Activity 2 Play Place Value Loopy. (Attachment 1) This game was introduced in the unit Building with tens. Distribute the cards to the class (or the group). In preparation for the game, first have the students read the lower clue, eg. ‘I have 6 tens and 8 ones. Who am I?’ on their card and name the number it describes. Then have them state the clue for the 2-digit number that appears at the top of the card. This is the clue they will listen for and respond to as the game proceeds. The student with the START card begins the game. Activity 3
Activity 4
Activity 5
Session 2SLO: Understand the structure of 3-digit numbers using a range of material representations and contexts. Activity 1
Activity 2
Activity 3
Activity 4.
Session 3SLOs:
Activity 1
Activity 2
Activity 3
Session 4SLO: Explore and understand the structure and size of 1000. Activity 1 Begin by playing the 3-digit Loopy class game created in Session 3, activity 3. Activity 2 As a class/group count to 500 in tens. Have two students model this simultaneously using MAB equipment. They will be making ten for one exchanges of equipment, as centuries are reached. Count to 500 in hundreds. Activity 3 Write ‘one thousand’ in words on the class/group chart. Ask the students to share all they know about one thousand and record all their ideas on the chart. If the students don’t suggest it independently, make the link to the counting exercise in 2. (above) by combining 500 + 500, highlighting : 5 + 5 = 10, 50 + 50 = 100, 500 + 500 = 1000. Activity 4
Activity 5
Activity 6
Session 5SLOs:
Activity 1
Activity 2 Have the students play Fish for 1000 (Attachment 7), making MAB material available.
Activity 3
Activity 4 (extension activity) The teacher displays the Thousands and Trendsetter houses. A student is invited to write a number of their choice, of up to six digits, on the PV houses. The student asks a classmate (or group member) to read the number and to give an interesting fact about the recorded number. For example: A student writes 50 000. The classmate reads ‘fifty thousand’ and says, ‘If it had another zero it would say five hundred thousand and it would be ten times bigger.’ Or a student writes 543 210. The classmate reads ‘five hundred and forty three thousand, two hundred and ten’ and says ‘if you took away three thousand it would say five hundred and forty thousand, two hundred and ten.’ Activity 5 (extension activity) Make available to the students the game 11,111 (Attachment 8). (Purpose: to recognise different representations of numbers to 10, 000 and combine these to make larger numbers) Discuss with the students the purpose and rules of the game, and allow them to play it in pairs or small groups.
Dear Parents and Whānau, In class we have been learning about place value in numbers to 1000. Your child would appreciate your support in playing the Licence Plates game. This activity will help your child:
What to do:
You may also enjoy making numbers together in the Modeling numbers: 3-digit numbers learning object. Thank you for supporting your child in consolidating this important place value understanding. |