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# Counting on and_back_y3

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### Counting on and_back_y3

1. 1. Look at these sequences.What is happening?1, 2, 3, 4, 5, 6, 7, 8, 9, 1010, 20, 30, 40, 50, 60, 70, 80, 90,100100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
2. 2. Counting on in tens.Counting on in tens means adding ten onto the previous number in thesequence.Practice:10, 20, 30, …, …, …, …, …, …, …, …,Now try starting at 100100, 110, …., ….., ….., ….., …..,
3. 3. Counting back in tens.Counting back in tens means taking ten awayfrom the previous number in the sequence.Try it:100, 90, ….., ….., ….., …..,Now try to complete this sequence. Can you fillin the gaps?120, ….., 100, ……, ……, 70
4. 4. Counting on and back inhundreds.Counting on and back in hundreds is similar tothe tens but this time you use hundredsinstead.Counting on:100, 200, 300, 400, 500Counting back:500, 400, 300, 200, 100
5. 5. Look carefully at thissequence!What changes in this sequence?256, 356, 456, 556, 656, 756, 856, 956What stays the same?
6. 6. Look at these sequences.Discuss with your friend what ishappening in each one.5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15122, 132, 142, 152, 162, 172, 182421, 521, 621, 721, 821, 921, 1021
7. 7. Look at these sequences.Discuss with your friend what ishappening in each one.5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15122, 132, 142, 152, 162, 172, 182421, 521, 621, 721, 821, 921, 1021