Formal agreement is the strictly grammatical agreement between the verb and the subject: a singular subject must be matched by a singular verb. Notional agreement is more flexible, and allows the verb to matched to the idea - notion- of the subject. For example

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Durable, easy to machine, high sap content gives it good water resistance, used for exterior building and flooring Another major advantage is that there are more grades to choose from, for example A 1 Face will be cheaper than Prime Quality because on one face will be prime whereas the reverse will be light character. This is ideal if you are using for something where only one face is seen like cladding or furniture. Being able to work with small offcuts can help you save money by utilizing leftover wood from previous projects or scraps. Learn techniques for joining small pieces together to create larger panels or incorporate them into smaller woodworking projects. The verb, run, agrees with the plural noun, wolves. In other words, all the wolves (none excluded), run through the woods. The implication being that there are many wolves in this group.I disagree with @choster and @Peter Shor, the gramatically correct sentence in both American and British English is

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Odd number of layers of veneer glued at 90 degree angles for strength, aesthetically pleasing outer layer In the first, the notion is unity so a singular verb is appropriate, in the second the notion is disunity so a plural verb is used.If you have multiple projects lined up or you’re working on a large-scale project, consider buying wood in bulk. Many wood suppliers offer discounts for purchasing larger quantities of wood. This can significantly reduce the overall cost per board foot, making it a cost-effective option in the long run. 4. Opt for Lower Grade Wood Are collective nouns (and in particular companies) always given a plural verb form, or are certain ones treated as singular? The best advice of all is probably: 'if in doubt, reword the sentence in a way that avoids the problem'. Ok, I concede defeat. We are dealing with collective nouns (something that should have been mentioned earlier), and it is true that the normal rules of grammar do not always apply here. There are certainly grammar sources that will argue that there are rules concerning where you should/shouldn't use singular/plural verbs with collective nouns. Eg: http://www.grammar-monster.com/lessons/singular_plural_%20collective_noun.htm and http://www.chompchomp.com/terms/collectivenoun.htm But these rules are so convoluted and unrealistic, that they appears to be an attempt to impose logic post facto to a situation that will not allow a single, simple, solution.