Multiplying and dividing by 10, 100 and 1000
The Maths Habit
A bank packs loose coins into rolls, and rolls into boxes. What does it do with ten rolls?
It packs them into one box. Ten of one thing make one of the next.
- Multiply by 10
- Make ten lots of a number.
- Divide by 10
- Share a number into ten equal parts.
- Exchange
- Swap ten counters in one column for one counter in the next column.
- Make ten of each counter.Ten lots of 2 ones is 20 ones.
- Swap each ten for one counter in the next column up.20 ones are 2 tens.
- Every counter has moved up one column.23 × 10 = 230
Ten 10 counters. Swap them for one counter. Which one?
One 100 counter
Work out 43 × 10. 430
Work out 61 × 10. 610
Work out 43 × 10. 430
Work out 207 × 10. 2070
Work out 43 × 10. 430
Work out 35 × 100. 3500
Work out 43 × 10. 430
Work out 8 × 1000. 8000
Work out 43 × 10. 430
Find the missing number. ? × 10 = 360 36
One 100 counter. Swap it for counters in the next column down. Which, and how many?
Ten 10 counters
Work out 560 ÷ 10. 56
Work out 940 ÷ 10. 94
Work out 560 ÷ 10. 56
Work out 2700 ÷ 100. 27
Is it right? Thumbs up or thumbs down.
34 × 10 = 340
Thumbs up50 × 10 = 5000
Thumbs down: it is 500800 ÷ 10 = 8
Thumbs down: it is 8025 × 100 = 2500
Thumbs up6000 ÷ 100 = 60
Thumbs up
Work out 45 × 10 × 10.
4500Which is bigger, 30 × 100 or 300 × 10?
Neither: both are 3000I multiply a number by 100 and get 7000. What was my number?
70
