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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Objective: Use written column addition to add numbers with one or two decimal places.

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Step 1: Write the numbers in columns, one above the other. 10s 1s. 0.1s 2 6. 8 + 1 5. 7. Step 2: Add the tenths column. Write the extra 1 in the 1s column. 10s 1s. 0.1s 2 6. 8 + 1 5. 7 1. 5 Hints: Leave a space before drawing the lines. Write the decimal point in the answer so you don’t forget it later.

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Step 3: Add the 1s, including the extra one. Write the extra ten in the 10s column. 10s 1s. 0.1s 2 6. 8 + 1 5. 7 1 1 2. 5 Step 4: Add the tens column. 10s 1s. 0.1s 2 6. 8 + 1 5. 7 1 1 4 2. 5

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Make a pair of three-digit numbers, each with one decimal place, and add them together. 9 7 5 3 2 1 0 8 4 6 Use the same cards to make the smallest total that you can and the largest possible total…

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Adding pairs of four digit numbers with two decimal places: 10s 1s. 0.1s 0.01s 2 6. 8 3 + 1 5. 7 8 1 1 1 4 2. 6 1 Discuss with a partner the steps shown for adding pairs of four digit numbers with two decimal places. Hint: Leave a space before drawing the lines. That way, there is somewhere to write the extra tenths, 1s and 10s.

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 Adding pairs of numbers with different numbers of decimal places: 2 6. 8 + 1 5. 7 8 Are you happy that this calculation has been set out correctly?

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© Hamilton Trust Keeping Up Term 3 Week 2 Day 3 37.5 + 23.8 58.2 + 42.9 27.58 + 35.6 Choose a challenge and solve all three questions to be a decimal dude or diva! Watch out… Convert numbers to decimals if necessary! 67.5 + 43.8 58.72 + 42.69 74.58 + 85.6 74.58 + 85.6 98.49 + 71.68 4.76m + 565cm 1.27km + 850m 0.18kg + 2650g 1580mL + 2.09L

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