# Pages 5 through 25Pages 47 through 65

## Pg 26 – Approximating multiplying by 142857 Pg 27 – Multiplying by 3367 Pg 28 – Multiplying by 143 Pg 29 – Add to 1 Mixed NumbersPg 30 – Difference of Two SquaresPg 31 – Sum of Two SquaresPg 32 – Greatest Common FactorPg 33 – Least Common Multiple Pg 34 – Multiplying a x a/bPg 35 – Multiplying Mixed Numbers with Same FractionsPg 36 – Multiplying Mixed Numbers with Different FractionsPg 37 – Converting Mixed Numbers Percents to fractions Pg 38 – Adding inverse fractionsPg 39 – Adding consecutive IntegersPg 40 – Divisibility RulesPg 41 – Multiplying a whole number by a mixed numberPg 42 – Union/Non-UnionPg 43 – Set TheoryPg 44 – Base b to Base 10Pg 45 – Base 10 to Base bPg 46 – Determining the Base of a Number

• Math Rocks on January 5, 2016 at 10:57 pm

How do you do a problem where x base 2 minus y base 2 =____ base 2, or 1011 base 2 – 1001 base 2= ___ base 2? I saw something in this format on the number sense TMSCA quiz. thanks

1. Just remember the rules of math still apply. In base two you need to carry when you make 2. Subtract borrow 2 etc.

• noah on November 1, 2018 at 9:53 pm

is there a calculator book

1. Not yet but one day there might be.

• Math Rocks on February 24, 2017 at 7:48 pm

Hi Mr, Gillespy,
I understand how to find IF a number is divisible by 11, but how do you know how much remainder a number divided by 11 has? For example, 4273 divided by 11.

1. I am re writting my book this summer and I have a better method. Basically start with the far right number and do this. 3 – 7 + 2 – 4 = -9 if the number you get is positive thats the remainder. If its negative subtract it from 11 so in this case the answers remainder 2.

• _mAtH on February 16, 2019 at 12:28 am

Does this trick only work for dividing by 11?

1. You could make new tricks with other numbers but this is for 11’s

• Number Sense Rocks on November 22, 2017 at 11:15 pm

Hi there

Even though you can kind of do these kind of problems in your head, I wanted to know if there is a faster way to do a problem like 12 1/2 x 88 or something like that. Would it be divide it by 88 by 8 and add 2 zeroes?

Thanks

1. Yep exactly .

• Awesome on June 6, 2019 at 5:08 pm

Is there a trick for 7 1/3 * 14 1/3

1. Yep book one has this information.

• Math Is Fun on June 4, 2020 at 3:28 pm

Is there a trick for figuring out how many terms a sequence has?
For example, how many terms does the sequence 2, 5, 8, 11, ……., 152 have?

1. Yes its in the blue book