2
Take-away story problems
Discover Mathematics P2: Term 2, Lessons 91–100
GoalSolve story problems that take away, compare, or ask how many are left.
New words
left · how many remain after some are taken awayhow many more · the difference when two amounts are comparedwhole · the biggest number, with all the parts together
Explanation
Many stories use subtraction. If some are taken away, given away, eaten or used, we subtract to find how many are left. If we compare two groups and ask how many more, we subtract the smaller number from the bigger one. Read the story twice, find the whole, and draw a bar. Then write the number sentence and a full answer. Youssef had 56 dates and ate 23. How many are left? 56 − 23 = 33 dates are left. Check by adding: 33 + 23 = 56.
Worked examples
Youssef had 56 dates and ate 23. How many are left? 56 − 23 = 33 dates.
Salma has 47 stickers and Hana has 30. How many more does Salma have? 47 − 30 = 17 more.
A microbus had 72 passengers. At the station 28 got off. 72 − 28 = 44 passengers are left.
Class activity
Story time. Take turns telling a take-away story with a name, a thing and two numbers under 100. The listener draws a bar, writes the number sentence and says the answer in a full sentence. Then check by adding.
Practice
1
Omar picked 90 oranges and sold 40. How many are left?
90 − 40 = 50 oranges.
2
Mariam had 64 beads and used 27 for a bracelet. How many beads are left?
64 − 27 = 37 beads.
3
A class has 28 girls and 19 boys. How many more girls than boys?
28 − 19 = 9 more girls.
4
A book has 80 pages. Nour has read 35. How many pages are left?
80 − 35 = 45 pages.
5
There were 120 chairs in a hall. 30 were taken away. How many are left?
120 − 30 = 90 chairs.