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Problems like 37 + … = 79

Problems like 37 + … = 79. I am learning to add mentally the ones and tens separately when appropriate. 84. Tens. Ones. Sam has $36 and is saving to buy a scooter for $78. How much more must he save?. Step 1: Let’s record what he needs. $8 (eight $1). $70 (seven $10).

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Problems like 37 + … = 79

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  1. Problems like 37 + … = 79 I am learning to add mentally the ones and tens separately when appropriate. 84 Tens Ones

  2. Sam has $36 and is saving to buy a scooter for $78. How much more must he save? Step 1: Let’s record what he needs. $8 (eight $1) $70 (seven $10) Step 2: Now record how much he actually has. $30 (three $10) $10 $6 (six $1) $10 Step 3: You can now see how much he must save. $10 and two $1 coins or $2 Four $10 notes or $40 1 1 $40 + $2 = $42 Sam must save $42 1 1 1 1 Important: Notice how both the ones and tens amount Sam has are both less than the amount he needs. This strategy works for problems like this.

  3. Kate has $14 and is saving to buy a concert ticket for $48. How much must she save? Step 1: Let’s record what she needs. $8 (eight $1) $40 (four $10) Step 2: Now record how much she actually has. $10 (one $10) $4 (four $1) Step 3: You can now see how much she must save. Three $10 notes or $30 and four $1 coins or $4 $10 $30 + $4 = $34. Kate must save $34 1 1 1 Important: Notice how both the ones and tens amount Kate has are both less than the amount she needs. This strategy works for problems like this. 1

  4. Taine has $35 and is saving to buy a new watch for $89. How much must he save? Try doing this example in your head. Step1: How many $1 coins must he save. 4 ($4) Step 2: How many $10 notes must he save. 5 ($50) Step 3: Add the two amounts together. How much must he save? $50 + $4 = $54

  5. Now try these questions on your own. Remember to add the ones and tens separately. Click again when you have completed each question and the answer will be displayed. 40 + 2 = 42 • 34 + …. = 76 • 18 + …. = 59 • 63 + … = 88 • 12 + …. = 65 • 36 + …. =87 40 + 1 = 41 20 + 5 = 25 50 + 3 = 53 50 + 1 = 51 Need some more practise? Try Pg48 of Teacher Tools Addition and Subtraction Book Numeracy resources

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