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Estimating
Strategies
Adding & Subtracting
Word Problems
100

Round 42 to the nearest 10

40

100

What strategy do you use for 6+7?

Doubles +1 or near doubles

100

310+50

360

100

Nancy picked 27 apples on Monday and 36 apples on Tuesday.  How many apples did she pick altogether?

Nancy picked 63 apples altogether.

200

What is the estimated sum of 25 + 83?

About 110

200

show your work using the making 10 strategy for 6+8

6+4=10 +4=14

200

181-143

38

200

There are 319 students at Ford and 429 students at Buck.  How many more students attend Buck? 

110 more students attend Buck. 

300

Round 1245 to the nearest hundred.

1200

300
show the other 3 statements in this fact family: 4+5=9

5+4=9, 9-5=4, 9-4=5

300

199+2546

2745

300

There are 459 books in the grade 1 classroom and 398 books in the grade 2 classroom.  How many books are there altogether?

There are 857 books altogether.

400

What is the estimated difference of 452-45?

About 400

400

Show the fact family sentences for these numbers: 5, 5, 10

5+5=10, 10-5=5

400

4567+9876

14,443

400

Saskatchewan became a province in 1905.  How many years ago was that?

Saskatchewan became a province 116 years ago. 

500

Round 7452 to the nearest 10 and nearest 100

7450 and 7500

500
What could the third number be in this fact family? (two answers) 6, 3

9, 3

500

1000-564

436

500
Students held a 2 day fundraiser and earned $321 the first day and $239 the next.  They owed $50 for the supplies.  How much money did the students raise after paying what they owed?

The students raised $510.