Mastering Rounding for Easy Counting
Rounding is a fundamental skill that helps in counting efficiently and accurately. Understanding how to round numbers to the nearest 10, 100, or 1000 is essential for estimating answers and making calculations simpler. This practice resource provides guidance on counting forward and backward in increments of 10 and 5, rounding numbers effectively, and mastering the art of estimating with confidence. Explore the concept of rounding and enhance your mathematical skills with these engaging exercises.
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Presentation Transcript
Rounding 22/02/2025 Starter: Count forward and backwards in 10 and 5 10, 30, ? 12, 17, ? 21, 26, ? 112, 117, ? 100,?,120, 50,?, 60, 38, ?, 28 31, ?, 41 238,?, 328 140, ?, 160 15,?,35, 10, ?, 20 19, 24, ? 110, ? 120 ?, 115 , 125 45,?, 25 27, 32, ? 16, 21, ? 29, ?, 19 145,?, 125 15, 25, ? 25, ?, 15 10, 5, ? 21, ?, 11 115, 125, ?, 12, 22, ? 37, 32, ? ?, 5, 10 26, ?, 36 212, 222, ? 38,?, 18, 67, 62, ? 17, 22, 91, ?, 111 338,?, 318, 10,?,30, 5, 10, ? 32, 27, ? 101, ?, 81 210,?,230, 27, 37, ? 62, ? 52 23, ?, 33 41, ?, 61 527, 537, ? 67, ? 87 62, 52, ? 23, 33, ? 31, ?, 11 221, 216, ?
Rounding 22/02/2025 22/02/2025 LO: I can : estimate answers by rounding numbers. Is to: Is to: Is to: Count forward and back in 10s 100s and 1000 s Round numbers below 100 to the nearest 10. Round numbers to the nearest 10, 100 and 1000. Emerging Developing Secure Keywords estimate round approximate
Rounding 22/02/2025 Rounding helps us count easily in tens and hundreds. If has you have 7 you might say I have almost 10 , because 7 is close to 10 1 2 3 4 5 6 7 8 9 10 next_btn_colour
Rounding 22/02/2025 Counting in tens is easy. Try this number line: 10 20 80 30 40 50 60 70 90 100 110 Complete these number sentences: 20 + 80 = 100 20 10 = 10 80 + 30 = 110 90 40 = 50 80 90 30 + 50 = 110 20 =
Rounding 22/02/2025 How do we know what to round to? 0 1 2 3 4 5 6 7 8 9 10 These numbers round up These numbers round down What would we round 7 to? 0 1 2 3 4 5 6 7 8 9 10 10
Rounding 22/02/2025 What would we round 37 to? 30 31 32 33 34 35 36 37 38 39 40 40 What would we round 73 to? 70 71 72 73 74 75 76 77 78 79 80 70 What would we round 55 to? 50 51 52 53 54 55 56 57 58 59 60 60
Rounding 22/02/2025 What are the smallest and largest numbers that you could round to 40? 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 35 44 There is always a difference of 9 between the smallest and the largest. Smallest possible Rounded number Largest possible 80 50 20 90 85 75 45 15 84 54 24 94
Rounding 22/02/2025 Round these numbers to the nearest ten. 68 70 13 10 40 30 44 25 80 90 79 87 92 90 55 60
Rounding 22/02/2025 Round these numbers to the nearest 10. Round to nearest the 10 Number Lowest 10 Highest 10 89 80 90 90 45 72 12 9 4712 5629 4755 9999
Rounding 22/02/2025 Round these numbers to the nearest 100. Round to the nearest 100 Number Lowest 100 Highest 100 376 300 400 400 1417 101 149 251 1891 24699 1999 237011
Rounding 22/02/2025 Round these numbers to the nearest 1000. Round to the nearest 1000 Number Lowest 1000 Highest 1000 1001 1000 2000 2000 2500 3999 132400 56471 55551 23986 1002568 563282
Rounding 22/02/2025 Choose your own numbers. Number
Rounding 22/02/2025 Complete the codebreaker. Question Answer Letter 387 is between 300 and _______. 1489 is between ________ and 1500. 980 is between 900 and _______. 32 is between 30 and _____. 863 is between 800 and ________. Round 7 to the nearest 10 Round 1420 to the nearest 100 Round 3,522 to the nearest 1000 Round 35 to the nearest 10 Round 1318 to the nearest 10 Round 995 to the nearest 10 Round 12.6 to the nearest 10 Round 430 to the nearest 1000 Round 52 to the nearest 100 Round 554 to the nearest 10 Round 5,555 to the nearest 1000 Round 397 to the nearest 10 Round 994 to the nearest 10 Round 1970 to the nearest 100 Round 54.69 to the nearest whole number Round 1429 to the nearest 1000 Round 45 to the nearest 100 Round 986 to the nearest 10 Round 452.9 to the nearest 10 Round 1363 to the nearest 100
