1st Grade
How are addition and subtraction connected?
{
"voice_prompt": "",
"manuscript": {
"title": {
"text": "How are addition and subtraction connected?",
"audio": "How are addition and subtraction connected?"
},
"description": {
"text": "Addition and subtraction are opposite operations. Addition puts numbers together to make a bigger number. Subtraction takes numbers away to make a smaller number.",
"audio": "Addition and subtraction are opposite operations. Addition puts numbers together to make a bigger number. Subtraction takes numbers away to make a smaller number."
},
"scenes": [
{
"text": "You use numbers every day! You also use addition and subtraction all the time \u2014 often without even realizing it. Addition and subtraction are like two pieces of the same puzzle.",
"latex": ""
},
{
"text": "Let\u2019s start with a simple example. You have 3 apples, and you get 2 more. How many apples do you have now? 3 plus 2 equals 5. Let\u2019s show that on a number line. Start at 3 and jump forward 2 steps \u2014 you land on 5!",
"latex": "3 + 2 = 5"
},
{
"text": "Now you have 5 apples, but you eat 2. How many are left? 5 minus 2 equals 3. On a number line, start at 5 and jump back 2 steps \u2014 you land on 3.",
"latex": "5 - 2 = 3"
},
{
"text": "Can you see the connection? Addition finds the total. Subtraction finds what\u2019s left or what\u2019s missing. They work like opposites!",
"latex": ""
},
{
"text": "Think of it like this: Addition moves you forward.",
"latex": "3 + 2 = 5"
},
{
"text": "Subtraction moves you backward.",
"latex": "5 - 2 = 3"
},
{
"text": "Here\u2019s a cool trick! You can use subtraction to check your addition. Let\u2019s say you add 10 plus 7 to get 17. On a number line, start at 10 and move forward 7 steps \u2014 you land on 17.",
"latex": "10 + 7 = 17"
},
{
"text": "To check it, take 17 and subtract 7. If you get 10, your answer is right! On a number line, start at 17 and jump back 7 \u2014 you land on 10.",
"latex": "17 - 7 = 10"
},
{
"text": "It works the other way too. If you do 15 minus 5, you get 10. Check it with addition: 10 plus 5 is 15.",
"latex": "10 + 5 = 15"
},
{
"text": "This is a great way to catch mistakes and know you got it right.",
"latex": ""
},
{
"text": "Now let\u2019s use this trick to find a missing number. What if 6 plus some number equals 14?",
"latex": "6 + ? = 14"
},
{
"text": "You can think: How much do I need to get from 6 to 14? Try subtraction! 14 minus 6 equals 8.",
"latex": "? = 14 - 6 = 8"
},
{
"text": "Here\u2019s another one: A number minus 4 is 9.",
"latex": "? - 4 = 9"
},
{
"text": "To find it, just add 9 and 4. That gives you 13!",
"latex": "? = 9 + 4 = 13"
},
{
"text": "So remember: If you know the total and one part, you can find the other. Use addition or subtraction based on what you know and what you need to find.",
"latex": ""
}
],
"outro": {
"text": "Addition and subtraction are opposite operations. Addition puts numbers together to make a bigger number. Subtraction takes numbers away to make a smaller number.",
"audio": "Addition and subtraction are opposite operations. Addition puts numbers together to make a bigger number. Subtraction takes numbers away to make a smaller number."
}
}
}
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