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Find here free online math videos topics related to addition and subtraction, meant for 1st, 2nd, 3rd, and 4th grades.

These videos match the topics in Math Mammoth Addition 1 (Blue Series).

Learn the symbols + and =

Addition facts within 10 — six videos matching the lessons titled "Sums with 6", "Sums with 7", "Sums with 8", "Sums with 9", and "Sums with 10".

Comparisons – compare numbers and sums

## Subtraction within 0-10 and related concepts

These videos match the topics in Math Mammoth Subtraction 1 worktext (Blue Series).

Subtraction and Addition in the Same Picture – the connection between subtraction and addition

Fact families

The concept of "how many more"

"How many more" problems and differences

## Addition & subtraction facts within 0-10

These videos match the topics in Math Mammoth Subtraction 1 worktext (Blue Series).

Addition and subtraction facts with 6 (fact families)

Addition and subtraction facts with 7 (fact families)

Addition and subtraction facts with 8 (fact families)

Addition and subtraction facts with 9 (fact families)

## Addition and Subtraction Facts Within 0-18

These videos match the topics in Math Mammoth Add & Subtract 2-A worktext (Blue Series).

A mental math trick with nine and eight

Difference, subtraction, and "How many more" additions

Number rainbow & fact families with 11

Number rainbow & fact families with 12

Number rainbow & fact families with 13

Number rainbow & fact families with 14

## Mental addition and subtraction of two-digit numbers

These videos match the topics in Math Mammoth Add & Subtract 2-B worktext (Blue Series).

Adding within the same ten – add a 2-digit number and a single-digit number mentally - no regrouping

Add and subtract two-digit numbers – without regrouping

Even & odd numbers

Doubling

One-half of a number

Pictographs

Add and subtract whole tens (to/from 2-digit numbers)

Going over ten — "make ten" (and go over ten) strategy for addition

## Regrouping in addition and subtraction (2-digit numbers)

These videos match the topics in Math Mammoth Add & Subtract 2-B worktext (Blue Series).

Add a 2-digit number and a single-digit number mentally – no regrouping

Regrouping with tens

Add three or four single-digit numbers mentally

Regrouping in subtraction, parts 1 and 2 (with 2-digit numbers)

Regrouping in subtraction, part 3 – includes word problems with Mathy and Giganto (mammoth mascots)

Mental subtraction, parts 1 and 2 – strategies for mental subtraction

## Regrouping in Addition and Subtraction with 3-digit numbers

These videos match the topics in Math Mammoth Add & Subtract 3 worktext (Blue Series).

Regrouping 10 tens as one hundred (3-digit addition)

Regrouping one hundred as 10 tens in subtraction

Regrouping one hundred as 10 tens in subtraction: word problems and puzzles

Regrouping twice in subtraction

The connection with addition and subtraction

Mileage chart

The order of operations — parenthesis, addition & subtraction only

These videos match the topics in Math Mammoth Add & Subtract 4 worktext (Blue Series).

Bar models in addition and subtraction problems

The order of operations and writing simple expressions

Making a bar graph plus word problems

Rounding 4-digit numbers

Estimating the final result

Calculate and estimate money amounts

Calculate and estimate money amounts: word problems

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