Year 3 mental arithmetic: Sets 5 and 6

This week I have the following two sets of mental arithmetic questions published for 3 years. They concentrate on one-step problems, recalling addition and subtraction facts up to 20, adding and subtracting multiples of ten and know 5 and 4 times tables.

There are several ways that these questions can be used and how children to answer them. It is sometimes a good idea to use a numeral cards, so that children can keep up the answer. Number of fans a similar goal. Sometimes you might want to be called the answers, or to be written. The sheets of the question can be used for this purpose.

Y3 mental arithmetic set 5 and 6

Bad boys of physics

In the July issue, about Lenny Susskind Scientific American runs a bad boy or Physics story (see also here). Here is the "nut graph":

Physicists want to understand the deepest levels of reality now largely working within a framework of Susskind. But a funny thing happened along the way. Susskind wonder or physicists reality can understand.

In the interview, Susskind explains that he was a bad boy as a youth, but "just so much better than anyone else, including the professor." In recent years he is the most prominent promoter of the string theory multiverse, and now claims that this pseudo-science convincing the area dominates (SciAm seems agree ...), with the situation like in the early days of QCD:

A large part of the physics community has left trying to explain our world so unique, as the only mathematically possible world. Right now the multiverse is the only game in town. Not everyone is working, but there is no coherent, sharp discussion against it.

In 1974 I had an interesting experience on how scientific consensus forms. People worked on the as yet untested theory of hadrons [subatomic particles such as protons and neutrons], that Quantum Chromodynamics or QCD is called. At a Conference of physics I asked, "you people, I would like to know your belief about the likelihood of QCD the correct theory of hadrons." I took a poll. Nobody gave it more than 5 percent. Then I asked: "what are you working on?" QCD, QCD, QCD. They worked all on QCD. The consensus was formed, but for some strange reason, people wanted their skeptical side. They wanted to be hard-nosed. There is an element of the same thing around the multiverse idea. A lot of physicists don't want to just fess up and say, "look, we do not know another alternative."

Susskind had a DISTINGUISHED career as a theorist for many years, and has managed to do very well with his multiverse campaign for quite a while now. There's a lot of coverage of this story on this blog, for some high points, see here, here, here and here.

In other news, the media full of stories about another physicist who has been a bad boy, David Flory. He began his career as a HEP theorist back in the late 1960s, as a student at the Yeshiva University, and collaborator with Susskind. Just as a large number of other people, he got his permanent academic job in 1969, and has since then at Fairleigh Dickinson University.

Year 5 Division problems: calculation of mentally

Here is the second page that year 5 Division problems who looks using mental skills can be answered. The questions deal with a number of concepts relating to Department, including:

scrap

divisibility rule for 9

and factors.

Watch out for errors that in issues such as number 9 occur, where the number of whole lengths of wire is calculated and the rest is irrelevant.

This page, and other similar worksheets can be found in the year 5 category.

Division problems (2)