Math Update!

We've begun a new unit in Math! We are discussing the multiplication of extended facts, i.e. extending our knowledge of multiplication facts of single digits to multiplying factors of ten.

For example, we know (original fact) that 4x5=20, so now we can think of (extended fact) 40x5=200  in a similar way by thinking of 40 as: 4 tens, 4 dimes, 4 base-ten "longs" (blocks consisting of ten small cubes), etc. A shortcut would be to multiply the extended fact as 4x5=20 and then add a zero to the answer.

We have also discussed more extended multiplication facts where BOTH factors are multiples of ten, for example 40x50=2000.

The same shortcut can apply: multiply 4x5=20 then add "00" to the answer. So if we understand that 4x5=20, we can understand that 40x5=200, and 40x50=2000. It is helpful to use the term "ten times as much" or "ten times as many" when doing work with multiples of ten.