1. Rounding to nearest 10

2. Rounding helps us count easily in tens and hundreds. Rounding 12345678910 If Bartosh has 7 toy cars, he might say “I have almost 10 cars”, because 7 is close to 10.

3. Counting in tens is easy. Try this number line: Complete these number sentences: 102080 20 + 80 = 80 + 30 = 20 – 10 = 90 – 40 = 110 – 20 =30 + 50 = Rounding tens 100 110 80 10 50 90 304050607090100110

4. 012345678910 These numbers round down These numbers round up What would we round 7 to? 012345678910 How do we know what to round to? Rounding tens 10

5. 3031323334353637383940 What would we round 73 to? What would we round 37 to? What would we round 55 to? 7071727374757677787980 5051525354555657585960 Rounding tens 70 60 40

6. What are the smallest and largest numbers that you could round to 40? 32333435363738394041424344454647 There is always a difference of 9 between the smallest and the largest. Smallest possibleRounded numberLargest possible 80 50 20 90 Rounding tens 75 45 15 85 54 24 94 84 3544

7. Round these numbers to the nearest ten. 68 44 79 92 13 25 55 87 7010 40 80 90 60 Rounding tens 30