Category: 04. Add and Subtract Whole Numbers

Word problem 1 (on addition): Yesterday, John had 237 baseball cards. Today he got 105 more. How many cards does John have now? Solution Step 1: Number of baseball cards John had = 237 Number of cards John got more = 105 Step 2: Number of cards John has now = 237 + 105 =…

Definition A fact family is a group of math facts using the same numbers. In the case of addition and subtraction, you use three numbers and get four facts. For example, you can form a fact family using the three numbers 3, 10, and 13: 10 + 3 = 13, 3 + 10 = 13,…

Problem 1: Subtract 6804 − 2547 Solution Step 1: Align the numbers vertically. Step 2: Since 4 is less than 7, we need to regroup in the ones place. We cannot borrow from zero, so we need to regroup in tens place as well. We regroup 8 to get 7 in hundreds place and ten…

Problem 1: Subtract the numbers 17 − 8 Solution Method 1 We subtract the numbers using a number line here. On the number line, start from the larger number 17 and then make 8 jumps to the left to land on 9. This is the difference between 17 and 8. Method 2 Counting backwards We…

Problem 1: Find the sum 3473 + 53 + 682 Solution Step 1: We line up the numbers vertically. Step 2: The digits in ones column are added. 3 + 3 + 2 = 8. So 8 is written below ones column. Step 3: Then the digits in tens column are added. 7 + 5…

Problem 1: Find the sum 562 + 76 Solution Step 1: We line up the numbers vertically. Step 2: We add the digits in ones column. 2 + 6 = 8. 8 is written below ones column. Step 3: Then we add the digits in tens column. 6 + 7 = 13. 3 is written…

Problem 1: Add the numbers 45 + 26 Solution Step 1: We line up the numbers vertically. Step 2: We add digits in ones column. 5 + 6 = 11. 1 is written below ones column and other 1 is carried over to the tens column. Step 3: In the tens column, 4 + 2…

Problem 1: Add the numbers 57 + 8 Solution Step 1: We line up the numbers vertically. Step 2: We add the digits in ones column. 7 + 8 = 15. 5 is written below ones column and 1 is carried over to tens column. Step 3: In tens column, 5 + 1 = 6.…

Problem 1: Add the numbers 36 + 51 Solution Step 1: Line up the numbers vertically. Step 2: We first add the digits in ones column. 6 + 1= 7. 7 is written below ones column. Step 3: Next we add the digits in tens column. 3 + 5 = 8. 8 is written below…

Problem 1: Add the single digit numbers. Solution Adding three numbers involves two steps Step 1: We add the first two numbers; 6 + 3 = 9 Step 2: Next we add the sum to third number; 9 + 4 = 13 We write down the result SoProblem 2: Add the numbers Solution Step 1:…