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Ones to Tens Addition
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Ones to Tens Addition
Use what you know about adding ones to help you add tens. Show your thinking where asked.
Choose the answer
1.A kite stall has 30 blue ribbons and 50 red ribbons. Which number sentence gives the total number of ribbons?
- 30 + 50 = 70
- 30 + 50 = 80
- 30 + 50 = 90
- 30 + 50 = 100
2.Hemi counts 7 small flags on each of 10 strings. What is 70 + 20?
- 80
- 90
- 100
- 120
3.At the kite festival, 6 kites are in one display and 3 are in another. If each kite represents 10 points, what is 60 + 30?
- 80
- 90
- 100
- 110
4.Levi sees 40 yellow kites and 40 green kites. How many kites are there altogether?
- 70
- 80
- 90
- 100
Work it out
5.Fill in both sums: 3 + 5 = ; therefore 30 + 50 = .
6.Complete the related sums: 8 + 1 = ; therefore 80 + 10 = .
7.Write the number of tens in 50 + 30, then give the total.
8.Ruben says, “Because 2 + 6 = 8, I can work out 20 + 60 = 80.” Explain why his idea works in one sentence.
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