Subtracting by counting up is a good way solve problems with larger numbers.
Example: 34 – 19 =
Think how much you should add to 19 to get 34.
Another technique is to take-away.
Exercises.
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Question 1 of 6
1. Question
Jenny has 42 crayons. she found 16 broken. How many crayon were not broken? Solve the problem by counting up.
-
Working:
Equation to solve this problem is
(Add tens to get close, then ones)
16 + =
+ =
+ =
Therefore: + + =
Answer =
Correct 14 / 14 PointsIncorrect / 14 Points -
-
Question 2 of 6
2. Question
66 children walk to school and 19 takes the bus. How many more walk to school than take the bus? Solve the problem by counting up.
-
Working:
Equation to solve this problem is
(Add tens to get close, then ones)
19 + =
+ =
+ =
Therefore: + + =
Answer =
Correct 14 / 14 PointsIncorrect / 14 Points -
-
Question 3 of 6
3. Question
A small school has 85 students. If there are 39 girls, how many are boys?
-
Working:
Equation to solve this problem is
(Add tens to get close, then ones)
39 + 40 =
+ = 80
+ =
Therefore: 40 + + =
Answer =
Correct 11 / 11 PointsIncorrect / 11 Points -
-
Question 4 of 6
4. Question
A grocer has 73 eggs. 24 were sold. How many eggs does the grocer have?
-
Working:
Equation to solve this problem is
(Take tens from tens, then subtract ones)
70 – = 50
– 4 =
46 + =
Answer =
Correct 7 / 7 PointsIncorrect / 7 Points -
-
Question 5 of 6
5. Question
68 sandwiches were made for two events. 47 was delivered to the Parents-Teachers Meeting. How much is left for the book club.
-
Working:
Equation to solve this problem is
(Take tens from tens, then subtract ones)
60 – =
– =
+ =
Answer =
Correct 10 / 10 PointsIncorrect / 10 Points -
-
Question 6 of 6
6. Question
A bakery have 45 cookies in the shop. The Baker has an order of 95 cookies. How many must the baker prepare to meet the order?
-
Working:
Equation to solve this problem is
(Take tens from tens, then subtract ones)
90 – =
– =
+ =
Answer =
Correct 10 / 10 PointsIncorrect / 10 Points -
