Elementary School Lessons

Notes #6

• Multiplying numbers by 2 is just like skip counting by 2s.
• Multiplying by 5 is just like skip counting by 5s.
• Multiplying by 10 is just like skip counting by 10s.

Notes #5

Multiplication is repeated addition.

A number line can be used to multiply numbers.

The Properties of Multiplication are:

1. Commutative Property of Multiplication:  changing the order of factors does not change the order of the product.
2. Identity Property of Multiplication: any number multiplied by 1 is equal to the same number.
3. Zero Property of Multiplication: any number multiplied by zero is equal to zero.

Notes #4

Multiplication is a way of putting together sets with the equal number of objects.

• The multiplicand gives the number of sets or groups.
• The multiplier gives the number of objects in each set.
• The answer in multiplication is called product.
• The multiplicand and the multiplier are also called factors.

Notes #3

• Subtraction with regrouping is done when the one digits of the minuend is less than the ones digit of the subtrahend.

• Regrouping is done by borrowing 1 ten from the tens digit of the minuend and adding this to the ones digit of the minuend.

Notes #2

• To subtract two-digit numbers, line up the ones digits in one column and the ten digits in another column.
• Subtract the ones digits first and the tens digits next.
• We can also an subtract numbers horizontally in expanded form.

Notes #1

•  Subtraction is the process of taking away a number from another number.
• The minuend is the number from which we subtract or the total number of objects.
• The subtrahend is the number that we subtract.
• The symbol for subtraction is – called the minus sign.
• The subtraction sentence is: minuend – subtrahend = difference.
• A number line can also be used for subtraction.

Julian loves Roman numeral numbers. I would be putting the Hindu-Arabic numbers here and I would let him put the Roman equivalents. No editing will be done, promise. Here goes:

28 – xxviii
541 -dxli

867 – dccclxvii

Julian encoded the Roman numerals himself. He didn’t even made these all caps, 🙂