Given, From the given tree, we can see that on each leaf there are addition and subtraction problems that need to be solved. Solving these problems we get, a) To find the missing minuend, add the difference and the subtrahend. _____ - 13 = 21 21 + 13 = 34 b) Add the corresponding ones and tens. 10 + 8 = _____ 10 + 8 = 18 c) When 0 is subtracted from a number, the result will be the same number. 14 - 0 = 14 d) To find the missing addend, subtract the given addend from the sum. 20 + _____ = 40 ⇒ 40 - 20 = 20 e) To find the subtrahend, subtract the difference from the minuend. 36 - ____ = 4 ⇒ 36 - 4 = 32 f) To find the missing addend, subtract the given addend from the sum. 17 + = 24 24 - 17 = 7 g) To find the missing addend, subtract the given addend from the sum. + 23 = 52 52 - 23 = 29 h) Subtract the two numbers, borrow 1 from 3 to make 2 into 12 . 32 - 25 = ? 32 - 25 = 7 i) To find the subtrahend, subtract the difference from the minuend. 24 - = 21 24 - 21 = 3 j) Add the ones and tens to find the sum. 26 + 13 = 26 + 13 = 39 Therefore, the solutions are represented on the tree as shown above.

Subtract and check your answer by addition: T O 6 7 - 4 9 T O +

Given: To subtract 49 from 67 and check the answer by addition. First let us subtract ones 9 from 7 . So, we regroup 67 as follows. 67 = 6 tens + 7 ones. = 5 tens + 17 ones. Write 5 in tens column and 17 in ones column as shown below. T O Borrow : 5 17 6 7 - 4 9 Now, subtract the ones. 17 ones - 9 ones = 8 ones. Thus, subtract the tens. 5 tens - 4 tens = 1 tens. Hence, T O Borrow : 5 17 6 7 - 4 9 1 8 Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 18 and 49 when we add. 18 + 49 , we get T O Carry : 1 1 8 + 4 9 6 7 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.

Subtract and check your answer by addition: T O 5 2 - 3 7 T O +

We need to subtract 37 from 52 and check the answer by addition. First, let us subtract the digits in ones place. As 2 < 7 , we borrow 10 from the tens place digit. Subtracting ones place after borrow: 12 - 7 = 5 Subtracting tens place after borrow: 4 - 3 = 1 4 12 5 2 - 3 7 1 5 Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 37 and 15 . 1 3 7 + 1 5 5 2 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.

Subtract and check your answer by addition: T O 9 4 - 5 9 T O +

Given: To subtract 59 from 94 and check the answer by addition. First let us subtract ones 9 from 4 . So, we regroup 94 as follows. 94 = 9 tens + 4 ones. = 8 tens + 14 ones. Write 8 in tens column and 14 in ones column as shown below. T O Borrow : 8 14 9 4 - 5 9 Now, subtract the ones. 14 ones - 9 ones = 5 ones. Thus, subtract the tens. 8 tens - 5 tens = 3 tens. Hence, T O Borrow : 8 14 9 4 - 5 9 3 5 Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 35 and 59 when we add. 35 + 59 , we get T O Carry : 1 3 5 + 5 9 9 4 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.

Subtract and check your answer by addition: T O 6 5 - 2 9 T O +

We need to subtract 29 from 65 and check the answer by addition. First, let us subtract the digits in ones place. As 5 < 9 , we borrow 10 from the tens place digit. Subtracting ones place after borrow: 15 - 9 = 6 Subtracting tens place after borrow: 5 - 2 = 3 5 15 6 5 - 2 9 3 6 Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 36 and 29 . 1 3 6 + 2 9 6 5 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.

Given, 20 + 5 = 25 In addition, when we change the position of the number then also we get the same answer. 20 + 5 = 25 5 + 20 = 25 Now, we will know the subtraction facts. 25 - 5 = 20 25 - 20 = 5 Hence, the required answer is given above.

Subtract and check your answer by addition: T O 8 7 - 1 8 T O +

Given: To subtract 18 from 87 and check the answer by addition. First let us subtract ones 8 from 7 . So, we regroup 87 as follows. 87 = 8 tens + 7 ones. = 7 tens + 17 ones. Write 7 in tens column and 17 in ones column as shown below. T O Borrow : 7 17 8 7 - 1 8 Now, subtract the ones. 17 ones - 8 ones = 9 ones. Thus, subtract the tens. 7 tens - 1 tens = 6 tens. Hence, T O Borrow : 7 17 8 7 - 1 8 6 9 Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 18 and 69 when we add. 18 + 69 , we get T O Carry : 1 1 8 + 6 9 8 7 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.

Subtract and check your answer by addition: T O 7 4 - 4 8 T O +

Given: To subtract 48 from 74 and check the answer by addition. First let us subtract ones 8 from 4 . So, we regroup 74 as follows. 74 = 7 tens + 4 ones. = 6 tens + 14 ones. Write 6 in tens column and 14 in ones column as shown below. 6 14 7 4 - 4 8 Now, subtract the ones. 14 ones - 8 ones = 6 ones. Thus, subtract the tens. 6 tens - 4 tens = 2 tens. Hence, 6 14 7 4 - 4 8 2 6 The answer is 26 . Now, let us check the subtraction by addition. To check the answer using addition, we add two smaller numbers. If the sum is equal to the bigger number, the obtained answer is correct. Here, two smaller numbers are 48 and 26 when we add. 48 + 26 , we get 1 4 8 + 2 6 7 4 Hence, the obtained sum is equal to the bigger number. Therefore, the given numbers are subtracted and checked using addition.