N14: estimate answers; check calculations using approximation and estimation, including answers obtained using technology

studied byStudied by 0 people
0.0(0)
learn
LearnA personalized and smart learning plan
exam
Practice TestTake a test on your terms and definitions
spaced repetition
Spaced RepetitionScientifically backed study method
heart puzzle
Matching GameHow quick can you match all your cards?
flashcards
FlashcardsStudy terms and definitions
Get a hint
Hint

Given that 43 × 16 = 688, find the answer to:

1) 688 ÷ 16

2) 1.6 × 4300

3) Estimate 68.8 ÷ 4.3

4) 68.8 ÷ 4.3

1 / 6

flashcard set

Earn XP

7 Terms

1

Given that 43 × 16 = 688, find the answer to:

1) 688 ÷ 16

2) 1.6 × 4300

3) Estimate 68.8 ÷ 4.3

4) 68.8 ÷ 4.3

1) 688 ÷ 16 = 43

2) 1.6 × 4300 = 6880 (16 was divided by 10, 4300 was multiplied by 100, overall change was x10 to give 6880)

3) 70 ÷ 5 = 14 (use the simplest numbers possible - 70/4 is harder)

4) 68.8 ÷ 4.3 = 16 (both sides were divided by 10 so the answer doesn’t change from the original sum)

New cards
2

What is estimation?

A rough calculation used to make answering problems easier

New cards
3

Estimate 7.1×97

7×100=700

New cards
4

Isla uses her mobile phone while abroad. She received 3 minutes of calls at 88p per minute. She made 7 minutes of calls at 71p per minute. She sent 4 text messages at 52p per message. Estimate the total cost.

3×90=270, 7×70=490, 4×50=200

270+490+200=960p or £9.60

New cards
5

702.1 + 299.3/1.9 × 5.1

700+300=1000, 2×5=10

1000/10=100

New cards
6

(4.022 +102)/0.51

4+10=14, 14×2=28

New cards
7

(50.77/0.513)

50×2=100

√100=10

New cards

Explore top notes

note Note
studied byStudied by 59 people
882 days ago
5.0(1)
note Note
studied byStudied by 93 people
1346 days ago
5.0(2)
note Note
studied byStudied by 23 people
799 days ago
5.0(1)
note Note
studied byStudied by 9 people
836 days ago
5.0(1)
note Note
studied byStudied by 24 people
612 days ago
5.0(1)
note Note
studied byStudied by 8 people
376 days ago
5.0(1)
note Note
studied byStudied by 12 people
833 days ago
5.0(1)
note Note
studied byStudied by 5751 people
648 days ago
5.0(32)

Explore top flashcards

flashcards Flashcard (37)
studied byStudied by 67 people
700 days ago
5.0(2)
flashcards Flashcard (60)
studied byStudied by 53 people
465 days ago
5.0(1)
flashcards Flashcard (156)
studied byStudied by 7 people
759 days ago
5.0(1)
flashcards Flashcard (81)
studied byStudied by 3 people
693 days ago
5.0(1)
flashcards Flashcard (43)
studied byStudied by 320 people
99 days ago
4.3(3)
flashcards Flashcard (37)
studied byStudied by 6 people
460 days ago
5.0(1)
flashcards Flashcard (23)
studied byStudied by 45 people
788 days ago
5.0(1)
flashcards Flashcard (127)
studied byStudied by 70 people
772 days ago
5.0(4)
robot