Sunday 12 November 2017

Disassembling Tens



In the pictures you can see second grade students working in groups of four: they are using Lego in order to assemble and disassemble numbers in UNITS AND TENS,

TASK 1: 
Student number 1 thinks of a number: i.e. 34

Student number 2 represents the number with Lego blocks. 
                      In this example, he needs three towers of ten  (TENS) and four units.
Student number 3 disassembles one of TENS.
Student number 4 says how many TENS and UNITS there are.
                      In this case, there are 2 TENS and 14 UNITS.

TASK 2: 
Student 1 thinks of a number with TENS and UNITS.
Student 2 thinks of another number with TEN and UNITS.
Student 3 makes the ADDITION.
                      He must bear in mind that if the number of units is bigger than ten, he will have to         assemble a new tower. 
Student 4 says the result, 




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